STEELE, Chief Justice for the Majority:
In this appeal of a denial of a postconviction relief motion, we examine whether defense counsel were ineffective during a defendant’s first-degree murder trial. We hold that the attorneys’ alleged failure to consult with a forensic pathologist or toxicologist, to present more evidence regarding the victim’s dominant hand, to investigate ballistics issues, appeal certain issues, and to object to the dismissal of jurors who indicated that they could not impose the death penalty did not prejudice the defendant during his trial’s guilt phase. During the penalty phase, however, the postconviction hearing judge failed to reweigh the aggravating evidence against the total mix of mitigating evidence in determining whether the attorneys’ failure to present additional evidence during the penalty phase prejudiced the defendant. Accordingly, we AFFIRM in part and REMAND in part so that the postconviction judge can supplement his opinion for further review.
I. FACTUAL AND PROCEDURAL BACKGROUND1
A. Heidi Ploofs Death
This case arises from the 2001 death of Heidi Ploof (Heidi). Heidi and her husband, Defendant-Appellant Gary Ploof (Ploof), lived in Hartly, Delaware. Ploof primarily worked as an aircraft mechanic [816]*816at Dover Air Force Base, while Heidi worked at a grocery store in Maryland. By late 2001, Ploof had begun an extramarital affair with Adrienne Hendricks, a coworker at his part-time job.
On November 1, 2001, the United States Air Force began providing employees with $100,000 in life insurance coverage for their spouses. The policies automatically became effective unless an employee opted out. After Ploofs supervisor informed him of the program, Ploof told her he planned to opt out, but he took no action to do so.
Sometime during the evening of November 3, 2001, Heidi left her job early after having an argument with her supervisor. She never returned home. Later that evening, Ploof reported that Heidi was missing.
On the morning of November 4, Ploof called Hendricks and his friend Richard Jackson to tell them that Heidi was still missing. Hendricks, Jackson, and Jackson’s wife went to Ploofs home to assist him. Some time after Jackson arrived, Ploof gave Jackson his .45-caliber automatic pistol and its case and asked Jackson to keep them for a while.
That same morning, a passerby discovered Heidi’s body in the driver’s seat of a car in the parking lot of a Dover discount store. Heidi had been shot in the left ear and the bullet had passed through her right cheek. The police found a .857-caliber bullet in the car, along with a bullet jacket. The store’s security camera recorded Heidi’s car entering the parking lot on the evening of November 3. The video footage showed a car driving into the lot, a man standing beside the driver’s side of the car after it was parked, and that same man walking away from the car toward the highway.
When the police informed Ploof of Heidi’s death later that day, they noted that while he appeared to be crying, he did not shed any tears. The officers interviewed Ploof but allowed him to return home later that evening. The investigating officer also noted that Ploof ceased crying after he informed Ploof of the store’s security footage.
On the evening of November 5, the police asked Ploof to return to the station for another interview. Before leaving for the interview, Ploof gave Jackson an empty gun case, which Jackson put in his vehicle. While the police were interviewing Ploof, another team of officers executed a search warrant on Ploofs property. When the police searched the premises, they found a concealed .357 Ruger Security Six Revolver and .357 shell casings. Ploof had denied owning any guns. The police later matched the bullet jacket in the car to the Ruger. Once the police discovered the gun, they arrested Ploof for Heidi’s murder. After learning of Ploofs arrest, Jackson called the police and turned over the .45-caliber pistol and gun cases he had been keeping for Ploof. A grand jury later indicted Ploof on the charges of Murder in the First Degree2 and Possession of a Firearm During the Commission of a Felony.3
While Ploof was incarcerated, investigators obtained two letters purporting to be from Heidi’s killer. These letters stated that they were written by a man who had been having an affair with Heidi, described details of Heidi’s death, and stated that Ploof was innocent. Officers found Ploofs fingerprints on the letters.
B. Ploofs Guilt-Phase Trial
Ploofs guilt-phase trial lasted nine days. The State presented testimony from police [817]*817officers, experts, an eyewitness, and Heidi’s and Ploofs friends and coworkers.
Deborah Jefferson, who worked at the discount store, testified for the State. Jefferson testified that while taking a break in front of the store on the evening of November 3, she saw a woman driving a car into the parking lot with a man in the passenger seat. According to Jefferson, the woman drove the car to the side of the store, and the man walked back to the front of the store toward the highway roughly ten minutes later. Jefferson recognized Ploofs clothing, and her description matched the image on the security camera’s footage.
Dr. Judith Tobin, a state medical examiner, served as an expert witness for the State.4 She had performed Heidi’s autopsy and described for the jury how Heidi had died. Tobin described the bullet’s probable trajectory and opined that the markings on Heidi’s body indicated that the bullet had been fired six to seven inches away from Heidi’s left side. Because family members had told Tobin that Heidi was right-handed, Tobin opined that it would be extremely difficult for a right-handed person to shoot herself from her left side. She testified that women seldom kill themselves with firearms and that she thought Heidi had been murdered.
Hendricks testified that she had been having an affair with Ploof before Heidi’s death. She stated that Ploof had told her that Heidi planned to move out of Ploofs home and that she should move in on November 5. Hendricks saw no boxes or other signs that Heidi planned to leave when she visited Ploof on November 4, however. Although Ploof appeared to cry intermittently throughout that day, Hendricks also never saw any tears.
Several witnesses testified that Ploof owned a Ruger and had recently told them that his money problems would soon be over. Ploofs supervisor testified that she had told Ploof about the Air Force’s plan to offer life insurance for spouses. Jackson testified that his wife became upset after hearing Ploof make a phone call shortly after Heidi’s death to see if he could collect Heidi’s life insurance.
Ploofs counsel during his trial (Trial Counsel)5 presented evidence she argued showed that Heidi had committed suicide. Ploof testified that Heidi was upset because a court had terminated her parental rights over a daughter from a previous relationship, and because the adoptive parent had recently warned her not to contact the child. Trial Counsel also presented testimony that Heidi had previously used drugs and was listed on Delaware’s Adult Abuse Registry6 because she had struck a resident at a nursing home. She had lost her job at the nursing home because of the incident. Also, Heidi had been rebuffed by a deliveryman after kissing him once and hugging him several times.
Ploof stated that Heidi was unhappy with her job at the grocery store. On the night of her death, she was upset after arguing with her supervisor and wanted Ploof to meet her in Dover. Heidi met Ploof at a location near the Dover discount store where a passerby later found her body. According to Ploof, Heidi began crying about all her problems, especially the termination of her parental rights. After Heidi refused to come home, Ploof began walking away from the car and [818]*818heard Heidi shoot herself. He stated that Heidi was ambidextrous and shot herself with her left hand. Upon seeing his wife commit suicide, Ploof decided to move Heidi’s body to the discount store’s parking lot so that the police would find her quickly. He claimed he did not report the suicide because he did not want people to know about the termination of Heidi’s parental rights and her other problems. Ploof hoped that the police would treat Heidi’s death as an unsolved murder. To accomplish this plan, he took the Ruger, ammunition, and gun case and put them in his truck. Then he got into the driver’s seat of Heidi’s car — with her body still in the same seat — and drove the car to the nearby discount store. He denied owning the Ruger. Ploof claimed he took it because he knew a gun dealer and hoped that he and the gun dealer could trace the gun’s origin to find out how Heidi acquired it.
Ploof testified that he wrote the letters purporting to be from Heidi’s real killer because his cellmate had told him that the police would have to release him if he did so. He denied that he had serious money problems and denied ever owning a Ruger, though he admitted owning the .45-caliber pistol.
The State presented rebuttal witnesses after the defense rested. Notably, Heidi’s left-handed brother testified that Heidi was right-handed and that he remembered because he had to adjust his fishing pole so that Heidi could use it.
After deliberating for two hours, the jury found Ploof guilty of Murder in the First Degree.7
C. Ploofs Penalty-Phase Trial and Direct Appeal8
Because the jury found Ploof guilty of Murder in the First Degree, the trial judge conducted the penalty hearing 11 Del. C. § 4209 requires.9 The State relied on two statutory aggravating factors in seeking the death penalty: (1) murder for pecuniary gain and (2) murder that was premeditated and the result of substantial planning.10 Defense Trial Counsel relied on twelve mitigating circumstances, including Ploofs background and his history of gainful employment. Trial Counsel also argued that Ploof had a distinguished military career and was unlikely to commit any future violent crimes. The State pre[819]*819sented testimony regarding Ploofs previous encounters with the law, his conduct in prison, and from Heidi’s family.
The jury unanimously found that Ploof killed Heidi for pecuniary gain.11 The jurors also unanimously recommended that all the aggravating evidence outweighed all the mitigating evidence. The trial judge reviewed the recommendation, found that the aggravating circumstances outweighed the mitigating circumstances, and imposed the death penalty.12
Ploofs counsel (Appellate Counsel) appealed the conviction, claiming that: (1) the trial judge erroneously refused to suppress evidence tainted by a Miranda v. Arizona13 violation, (2) two of the State’s peremptory challenges violated Batson v. Kentucky,14, (3) the prosecutor’s reference to Ploofs “public defender” prejudiced him, (4) the trial judge erroneously denied Ploofs motion to bifurcate the sentencing hearing, and (5) Ploofs death sentence was disproportionate to sentences imposed in similar cases.15 We rejected each argument and affirmed the conviction.16
D. Postconviction Proceedings
On July 6, 2005, Ploof filed a pro se motion for postconviction relief under Superior Court Criminal Rule 61. After the State filed an answer to Ploofs motion, Ploof was assigned counsel who supplemented Ploofs pro se motion and replied to the State’s answer. That attorney was excused because of a conflict, and a new attorney was appointed and was eventually excused without having filed anything further. Finally, another attorney was assigned and further amended and supplemented Ploofs motion.
At the postconviction relief hearing, Ploof offered the testimony of Ashley Hurley, Ploofs daughter from a previous marriage. Hurley testified that she saw Heidi every other weekend and that they had a close relationship. She also testified that Heidi was left-handed and unhappy after losing her parental rights over her daughter. When Hurley heard that Heidi had died, she immediately suspected that Heidi had killed herself. Ploofs postconviction counsel also presented testimony from Dr. Werner Spitz, a forensic pathologist, who disagreed with aspects of Tobin’s trial testimony and stated that it was possible that Heidi had committed suicide.17
At the postconviction hearing, Ploof presented new mitigation evidence about his childhood and his military record. Trial Counsel had investigated Ploofs upbringing, but Ploof had reported a normal childhood and his parents, Gerald and Shirley Ploof, had corroborated his story. Although Trial Counsel had a document indicating that the State of New York had involuntarily closed the Ploofs’ foster home in 1984, she did not recall seeing the specific page describing the closure. Trial Counsel testified about her investigation, suspicions, and decision-making process during her representation of Ploof.
Ploofs postconviction counsel presented testimony from several former Ploof foster children and expert testimony from a psychologist. The former foster children testified that Ploofs father, Gerald Ploof (Gerald), had sexually abused them and [820]*820physically abused Ploof. Ploofs mother, Shirley Ploof (Shirley), was extremely strict and distant from the family. The State of New York closed the Ploofs’ foster home because it received complaints that Ploof had sexual contact with the foster children.
After hearing testimony and considering the parties’ submissions, the judge denied Ploofs motion for postconviction relief.18 Ploof appealed.
II. STANDARD OF REVIEW
We review a Superior Court judge’s decision to deny postconviction relief for an abuse of discretion.19 When deciding legal or constitutional questions, we apply a de novo standard of review.20
III. ANALYSIS
A. Standards Governing Postconviction Relief Proceedings and Ineffective Assistance of Counsel Claims
Superior Court Criminal Rule 61 governs postconviction relief motions. Rule 61 is intended to correct errors in the trial process, not to allow defendants unlimited opportunities to relitigate their convictions. There are several limitations on the availability of postconviction relief. First, defendants must file postconviction relief motions no more than three years after their conviction becomes final.21 If a defendant asserts a ground for relief that could have been asserted in the proceedings leading to the conviction, a court cannot grant postconviction relief unless the defendant shows cause for relief and prejudice from a violation of his rights.22 A defendant’s failure to assert a claim within the time limits, or to assert a ground for relief in the proceedings leading to his conviction, will not bar postconviction relief if the defendant raises a colorable claim that there was a miscarriage of justice because of a constitutional violation that undermined the proceedings’ fundamental legality, reliability, integrity, or fairness.23 Finally, a court cannot reevaluate formerly adjudicated claims unless reconsideration is warranted in “the interest of justice.”24
Many of Ploofs claims assert that Trial Counsel or Appellate Counsel were ineffective. We generally decline to consider ineffective assistance of counsel claims in a direct appeal so that the defendant can fully investigate the issue in a postconviction proceeding.25 Therefore, Rule 61(i)(3) does not bar Ploofs ineffective assistance of counsel claims. To analyze these claims, we turn to the well-worn standards articulated by the United States Supreme Court in Strickland v. Washington,26 Strickland establishes a two-pronged test to determine whether a defendant was denied his Sixth Amendment right to effective assistance of counsel.27 [821]*821“First, the defendant must show that counsel’s performance was deficient.”28 To meet this standard, the “defendant must show that counsel’s representation fell below an objective standard of reasonableness.” 29 “Second, the defendant must show that the deficient performance prejudiced the defense.”30 “This requires showing that counsel’s errors were so serious as to deprive the defendant of a fair trial, a trial whose result is reliable.”31
The United States Supreme Court has cautioned us to eliminate the “distorting effects of hindsight” and “indulge a strong presumption that counsel’s conduct falls within the wide range of reasonable professional assistance” when considering an ineffective assistance of counsel claim.32 We measure an attorney’s conduct against an objective standard of reasonableness based on prevailing professional norms.33 Although American Bar Association standards are guides to reasonableness, they are only guides.34 “[Strategic choices made after thorough investigation of law and facts relevant to plausible options are virtually unchallengeable; and strategic choices made after less than complete investigation are reasonable precisely to the extent that reasonable professional judgments support the limitations on investigation.”35
To establish prejudice, “[t]he defendant must show that there is a reasonable probability that, but for counsel’s unprofessional errors, the result of the proceeding would have been different.”36 “A reasonable probability is a probability sufficient to undermine confidence in the outcome” — a lower standard than “more likely than not.”37 These standards frame our analysis of Ploofs postconviction claims.
B. Does Rule 61 Bar Some of Ploofs Claims and has Ploof Waived Certain Claims on Appeal?
1. Are Ploofs Claims Time Barred?
We begin by applying Rule 61’s procedural bars. First, the State argues that many of Ploofs claims are time-barred because his postconviction counsel asserted new claims by amending his initial postconviction relief motion after the Rule’s three-year time period expired.38 We reject this argument. Because Ploof filed a postconviction relief motion within three years of his conviction, his original motion was timely. The postconviction judge permitted Ploofs counsel to amend the original motion to add new claims under Rule 61(b)(6). We hold that Rule 61’s time limit applies only to the initial filing, and that Rule 61 grants Superior Court judges discretion to permit defendants to amend their motions when justice so requires.39 Ploofs claims are not time-[822]*822barred.
2. Can Ploof Incorporate Arguments by Referencing His Superior Court Briefs?
Ploof requested an additional twenty pages of argument for his opening brief in this appeal.40 We granted Ploofs request in part and allowed him to extend his opening brief by ten pages. Ploof proceeded to include approximately forty-five additional pages of argument by describing claims in single sentences and incorporating by reference the Superior Court briefs filed as part of his appendix.41 The State argues that Ploof has waived those claims.
Under Supreme Court Rule 14, an appellant waives an argument if he does not argue its merits within the body of his opening brief.42 Our case law holds that the opening brief must “fully state the grounds for appeal, as well as the arguments and supporting authorities on each issue or claim of reversible error.”43 If a party only casually mentions an issue, that cursory treatment is insufficient to preserve the issue for appeal.44 “In order to develop a legal argument effectively, the [o]pening [b]rief must marshal[ ] the relevant facts and establish reversible error by demonstrating why the action at trial was contrary to either controlling precedent or persuasive decisional authority from other jurisdictions.”45 If a party fails to cite any authority in support of a legal argument, we will deem that argument waived.46
Supreme Court Rule 14 bars Ploofs attempt to incorporate arguments by referring to the Superior Court briefs in his appendix. Rule 14’s requirement that Ploof raise the merits of his argument within the body of his opening brief was clearly not satisfied by Ploof combining a conclusory statement with a reference to material outside of his brief. Other courts have also held that an appellant may not [823]*823incorporate his trial court pleadings by reference.47 The reasons for this rule are obvious. First, incorporating arguments by reference to trial court filings does not address the trial judge’s reasons for rejecting those claims.48 Even though we review legal issues de novo, appellate briefs must explain why the trial judge erred and cannot ignore the judge’s reasoning.49 Second, incorporating arguments by reference to an appendix allows parties to ignore clearly established page limitations, leading to unfocused, ineffective arguments.50 Ploof s attempt to incorporate his Superior Court filings doubled the length of his forty-five page brief, despite our having granted him additional pages. Parties may use their appendix to provide context and record support for their arguments; they cannot transform the appendix into a de facto brief.51 Finally, we note that the claims incorporated by reference involve alleged violations of federal constitutional rights. Ploofs failure to develop these arguments on appeal is inconsistent with his claim that the alleged constitutional violations are serious.52
We, therefore, conclude that Ploof has waived the issues he attempts to raise by referring to the Superior Court briefs in his appendix. Our rules and precedent are clear, and to hold otherwise would create a travesty of our appellate process. We consider only the issues Ploof has properly presented to us under Supreme Court Rule 14.
C. Did Ploof Receive Ineffective Assistance of Counsel During the Trial’s Guilt Phase?
Ploof argues that Trial Counsel provided ineffective representation during his guilt-phase trial. He argues that Trial Counsel should have consulted with a ballistics expert, toxicologist, and forensic pathologist in order to properly support his theory that Heidi committed suicide. Ploof also [824]*824contends that Trial Counsel should have presented more evidence that Heidi was ambidextrous. Ploof next asserts that Trial Counsel’s questions during Deborah Jefferson’s cross-examination were inconsistent with the suicide theory and prejudiced his defense. Finally, Ploof argues that Trial Counsel was ineffective because she failed to attempt to rehabilitate or object to the dismissal of prospective jurors who expressed objections to the death penalty.
We begin by addressing the ballistics, toxicology, dominant hand, and forensic pathology issues. We then proceed to analyze whether Ploof has established Trial Counsel’s alleged failures constituted ineffective assistance of counsel.
1. Trial Counsel’s Failure to Investigate Ballistics, Toxicology, and Dominant Hand Issues or to Consult with a Ballistics, Toxicology, or Forensic Pathology Expert
a. Tobin’s Trial Testimony and the New Evidence from the Post-conviction Proceedings
i.Ballistics Evidence
Ploof first argues that Trial Counsel was ineffective because she failed to adequately investigate ballistics evidence while preparing for trial. At trial, Tobin opined that the Ruger was fired six or seven inches away from Heidi. Tobin noted that it would be very difficult for a right-handed person to shoot herself six or seven inches away from her left side, although she admitted it was possible Heidi had committed suicide.
At the postconviction hearing, Spitz testified that investigators needed to test fire the Ruger to accurately determine its range.53 He noted that most self-inflicted gunshot wounds are contact or very close range. While he agreed with Tobin that Heidi’s wound was not a contact wound, he opined that the gun was fired at a distance of less than five inches but more than half an inch. He also admitted that it was possible Heidi had shot herself.
ii. Toxicology Evidence
At trial, Tobin testified that although preliminary testing of Heidi’s urine revealed marijuana and several other substances, confirmatory screenings for the other substances had come back negative. The State did not confirm the presence of marijuana because it can remain in the body for up to two weeks after use, therefore, further testing would not help investigators determine how Heidi had died. To-bin testified that the toxicology report therefore did not impact her conclusion regarding Heidi’s cause of death. In contrast, Spitz opined that Heidi may have used marijuana within two days of her death. Ploof contends that this evidence would have bolstered his suicide theory.
iii. Evidence that Heidi was Ambidextrous
At trial, Heidi’s brother testified that Heidi was right-handed. Because the brother was left-handed, he recalled adjusting his fishing pole so that Heidi could use it. Tobin also understood Heidi to be right-handed. She testified that it would be extremely difficult for a right-handed person to shoot herself on the left side of her head at the angle and distance of the gunshot. It would be very difficult for Heidi to shoot herself using her right hand on the left side of her face, and she would have had difficulty aiming the gun using her left hand. Ploof, however, testified that Heidi was ambidextrous.
[825]*825At the postconviction hearing, Spitz testified that Heidi might have been left-handed based on his review of two photographs of Heidi holding objects in her left hand. Trial Counsel had access to the photographs, but she did not present them. Ashley Hurley, Ploofs (but not Heidi’s) daughter, testified that Heidi wrote with her left hand. Trial Counsel did not interview Hurley, but she did interview two of Heidi’s coworkers, who each stated that Heidi was right-handed.
iv. Forensic Pathology Evidence
The State presented testimony from To-bin regarding female suicide rates at trial. Tobin testified that women rarely commit suicide using a firearm. Tobin had performed thousands of autopsies during her career, but only recalled seeing five female gunshot suicides. In response to another question, Tobin stated that textbooks recommend that if a woman is found with a gunshot wound, investigators should consider it a homicide until proven otherwise. Tobin did not believe that Heidi committed suicide.
At the postconviction hearing, Ploof presented a study showing that between one-quarter and one-third of female suicides involve firearms. Another study indicated that firearms were the single most popular suicide method for women, though women were still much less likely than men to use a firearm. These studies contradicted the textbooks Tobin cited. Spitz stated that he could not determine how Heidi had died based on the materials Ploofs postconviction counsel had provided.
b. Did Trial Counsel’s Alleged Deficiencies Establish Ineffective Assistance of Counsel under Strickland v. Washington?
The United States Supreme Court has cautioned judges to avoid academic attempts to “grade counsel’s performance.” 54 Strickland is a two-pronged test, and there is no need to examine whether an attorney performed deficiently if the deficiency did not prejudice the defendant.55 We therefore begin by analyzing whether Ploof has established Strickland’s “prejudice” prong.56
i. Ballistics Evidence
Had Spitz testified at trial, he could have disputed Tobin’s conclusion that the fatal shot had been fired from six to seven inches away, and testified that he thought Heidi had possibly committed suicide. Spitz’s testimony, however, is not as helpful as Ploof asserts. Spitz’s conflicting expert testimony would merely create a factual dispute for the jury — whether the gun was held six to seven inches from Heidi or somewhere between a half inch and five inches away. Even if the jury believed Spitz instead of Tobin, this conclusion would still be several steps removed from concluding that Heidi shot herself.
Other courts have overturned convictions because an attorney failed to investigate ballistics issues, but those cases involved very different facts. In Troedel v. Wainwright, there were two defendants and the crucial issue was who fired the fatal shot.57 The prosecution’s expert tes[826]*826tified that the defendant had fired the shot, but the defendant’s expert at the federal habeas hearing showed that the prosecution’s expert did not base his conclusion on the tests the prosecution conducted.58 Because the expert’s testimony was the only way that the jury could have found beyond a reasonable doubt that the defendant had fired the lethal shot, trial counsel’s failure to investigate prejudiced the defendant.59 Similarly, in Harris ex rel. Ramseyer v. Blodgett, two defendants were accused of killing the victim.60 Defense counsel failed to discover that the investigating officer did not think that two people shot the victim, given the location of the entry wounds and that the officer believed the victim had collapsed immediately, making it impossible for the first shooter to pass the gun to the defendant to take a second shot.61 This evidence would have made it unlikely that the defendant had murdered the victim.62
Spitz’s ballistics testimony was less relevant to Ploofs case. Moreover, it did not conflict with Tobin’s testimony in the same way as the new evidence in Troedel and Harris, which directly contradicted the prosecution’s evidence regarding a crucial issue in the case. Here, Spitz’s testimony indicated that the gun may have been slightly closer to Heidi, but this testimony was completely consistent with the State’s murder theory. Spitz indicated that suicide was a possibility, but Tobin also conceded that she could not rule out suicide. This ballistics testimony may have helped Ploofs defense marginally, but it is not sufficient to establish prejudice under Strickland.
Ploof has also failed to establish that Trial Counsel’s failure to consult with a toxicologist prejudiced him. While To-bin testified that Heidi could have used marijuana as long as two weeks before her death, Spitz believed that Heidi had used marijuana within two days of her death. Notably, Spitz did not state that Heidi was under the influence of any other drug near the time of her death. As the postconviction judge noted, even if Heidi had been under the influence of marijuana, that does not create a reasonable probability that a jury would have determined that she committed suicide.63 The jury knew that Heidi had abused drugs and that the preliminary toxicology report indicated that Heidi may have used marijuana during the previous two weeks. Establishing that Heidi had used marijuana in the two days preceding her death does not measurably alter this analysis and, therefore, does not establish prejudice under Strickland.
Similarly, additional evidence that Heidi was ambidextrous would be of little benefit to the defense. If Trial Counsel had presented additional testimony and the photographs, that would have further supported Ploofs claim that Heidi was ambidextrous, and would have created a credibility question for the jury because Heidi’s brother testified that Heidi was right-[827]*827handed. The jury would not necessarily have resolved this issue in Ploofs favor. Even if the jury determined that Heidi was ambidextrous, this determination would have made the suicide theory less physically unlikely. In short, if Trial Counsel had presented the additional evidence, it would have created a credibility dispute that, if resolved in Ploofs favor, would have marginally bolstered the physical possibility of the suicide theory, but not increased the likelihood that Heidi had killed herself. Even viewed in conjunction with Spitz’s opinion that the weapon had been fired slightly closer to Heidi’s head, the additional testimony regarding handedness would have made only a negligible difference. The handedness evidence falls far short of establishing prejudice under Strickland.
Nor does Trial Counsel’s failure to consult with a forensic pathologist to impeach Tobin’s trial testimony establish prejudice under Strickland. If Trial Counsel had consulted with a forensic pathologist, she could have shown that a substantial number of female suicides involve firearms and that studies contradict statements in the textbooks that a female death by gunshot can be presumed a homicide until proven otherwise.64 While Trial Counsel’s omission might be prejudicial if there had been less direct and circumstantial evidence of murder, we are satisfied that Tobin’s statistical testimony played little role in the jury’s decision. Ploof does not controvert Tobin’s statement that she had observed only five female suicides using firearms and Ploofs studies indicate that women are much less likely to kill themselves with firearms than men. Although consulting with a forensic pathologist could have called Tobin’s generalized statements into question, it would not have measurably altered the balance of the evidence, which overwhelmingly favored the State’s murder theory.
v. Cumulative Prejudice
In sum, Ploofs new evidence might have moved his suicide theory closer to the realm of physical possibility, but it does not address the ample witness testimony, Ploofs inexplicable conduct, and the other evidence weighing in favor of guilt. If Trial Counsel had done everything Ploof now contends she should have done, the jury would have heard (1) the gun might have been fired slightly closer to Heidi’s head, (2) Heidi may have used marijuana within two days of her death, (3) Heidi’s stepdaughter thought Heidi was left-handed and two photographs show Heidi holding objects in her left hand, and (4) a significant percentage of female suicides involve guns.
The suicide theory Ploof offered at trial foundered on numerous grounds independent of Tobin’s testimony. Ploof testified that, after seeing Heidi shoot herself, he got into the same seat where Heidi’s body lay and drove her to the discount store. That testimony conflicted with the testimony of a neutral eyewitness who saw Ploof in the passenger seat of Heidi’s car and a woman driving the vehicle. The new evidence does not alter Hendricks’s testimony that Ploof had told her to move into his house on November 5, or Jackson’s testimony that his wife angrily exclaimed that Ploof had tried to collect Heidi’s life insurance. Nor does this new scenario address Ploofs decision to give his gun and gun case to a friend and then to tell the police [828]*828that he owned no guns. Even at trial, Ploofs testimony that he did not own the Ruger conflicted with that of multiple independent witnesses who stated that Ploof owned the gun. Finally, Ploofs decision to write two letters, purporting to be from Heidi’s real killer and stating that Heidi had been having an affair, conflicts with his testimony that the entire reason for concealing Heidi’s suicide was to protect her reputation.
Ploof cites several court decisions overturning convictions because attorneys failed to consult with experts. The expert testimony in those cases, however, fatally undermined the prosecution’s expert witnesses, who provided the only corroborating evidence in the case. In Gersten v. Senkowski, a child sexual abuse case, the prosecution’s case relied on the victim’s testimony and medical experts.65 If the defense attorney had consulted with an expert, he would have discovered that the medical evidence did not corroborate the victim’s story — which was critical because the victim’s testimony provided the only direct evidence.66 In contrast to Gersten, Tobin’s testimony was far less important to the State, which had ample direct and circumstantial evidence that Ploof murdered Heidi. Also in contrast to Gersten, Spitz’s testimony did not conflict with the prosecution’s theory of the case. Spitz noted that it was possible Heidi had committed suicide but did not state that his findings were inconsistent with murder.
Even if it was assumed that Trial Counsel’s failure to present ballistics, toxicology, forensic, evidence, and dominant hand evidence fell below an objective standard of reasonableness, Ploof cannot show that Trial Counsel’s alleged deficiencies prejudiced him. It was Ploofs inexplicable conduct and the contrary testimony of multiple independent witnesses that caused the jury to reject his suicide theory — not Trial Counsel’s failure to dispute issues tangential to the question of how Heidi died. Even if Trial Counsel had presented the ballistics, toxicology, forensic pathology, and dominant hand issues to the jury, that would not have created a reasonable probability of a different result. Because we hold that Ploof has failed to establish prejudice under Strickland, we do not address whether Trial Counsel’s conduct fell below an objective standard of reasonableness.
2. Trial Counsel’s Failure to Cross-Examine Deborah Jefferson in Keeping with a Single, Coherent Defensive Theorg67
Ploof next claims that Trial Counsel was ineffective because her cross-examination of Deborah Jefferson was inconsistent with the defense’s suicide theory. Trial Counsel asked Jefferson several questions that seemed to cast doubt on Jefferson’s identification of Ploof as the man she saw on the night of Heidi’s death.68 This was allegedly inconsistent with Ploofs suicide theory, which conceded [829]*829Ploofs presence at the discount store that night. Ploof claims this questioning prejudiced him because it undermined the credibility of his suicide theory.
This alleged deficiency also fails to meet Strickland’s prejudice prong. At worst, the line of questioning neither helped nor hindered Ploofs defense, because he admitted that he was at the store on the night of Heidi’s death. Trial Counsel’s attempts to cast doubt on Jefferson’s recollection may have been “inconsistent” in the sense that Ploof conceded he was at the store, but they did not directly contradict the suicide defense. Arguably, these questions benefited Ploof, because they called Jefferson’s recollection into doubt. Jefferson testified that she saw Heidi driving the car into the parking lot and saw Ploof in the passenger seat. This testimony was devastating, because Ploof claimed that he had driven the car into the parking lot and that Heidi was already dead. Trial Counsel’s attempt to highlight discrepancies in Jefferson’s testimony could have caused the jurors to discount her entire recollection, including her description of Heidi driving the car and Ploof riding in the passenger seat. Because any inconsistency in crossexamination was at worst neutral to Ploof and arguably beneficial to him, Ploof has not established prejudice. Even combined with the evidence discussed in Part III.C.1 supra, the cumulative effect of Trial Counsel’s purported errors falls far short of establishing a reasonable probability of a different result.
3. Trial Counsel’s Failure to Rehabilitate or Object to the Dismissal of Jurors Dismissed for Cause Due to Their Beliefs Regarding the Death Penalty69
Ploof next argues that Trial Counsel should have attempted to rehabilitate prospective jurors who were dismissed due to their views on the death penalty or objected to their dismissals.70 In Wither-spoon v. Illinois, the United States Supreme Court held that prospective jurors may not be excused for cause merely because they voiced general objections to the death penalty or had “conscientious or religious scruples against its infliction.”71 The Court clarified Witherspoon in Wainwright v. Witt, holding that a prospective juror may be excluded for cause if “the juror’s views would ‘prevent or substantially impair the performance of his duties as a juror in accordance with his instructions and his oath.’ ”72 The prosecution does not need to prove the juror’s bias with unmistakable clarity.73 We give trial judges broad discretion in deciding whether a potential juror should be excused for cause.74
[830]*830Ploof has not shown that Trial Counsel’s conduct during voir dire prejudiced him. Both on appeal and before the postconviction judge, Ploof focuses on prospective juror Amy Kellam’s voir dire examination. Kellam initially responded, ‘Tes,” when the trial judge asked her if she believed a life sentence was the only appropriate punishment for first-degree murder. But, Kellam later replied, ‘Tes,” when the trial judge inquired whether she could recommend a sentence of death if the law and evidence so warranted regardless of her personal feelings.75 Later in the voir dire, however, the following exchange occurred:
The Court: Could you vote to impose the death penalty?
Kellam: Could I vote ... no, no.
The Court: I asked you could you vote to impose the death penalty, you answered no. Would you explain why you answered no?
Kellam: Well, I don’t think nobody [sic] should be given the death penalty.
The Court: Is that under any circumstances?
Kellam: Tes.76
Trial Counsel advised the court that because Kellam’s answers were ambiguous, she would not take a position in response to the State’s challenge for cause. As the postconviction judge found, despite Kel-lam’s initial contradictory answers, she clearly stated at the end of the voir dire that she could not recommend the death penalty under any circumstances.77 In light of this clear statement, the trial judge acted well within his broad discretion to excuse Kellam for cause. We cannot discern even a reasonable probability that an attempt at rehabilitation or an objection from Trial Counsel would have stood any chance of success.
Ploof s generalized ineffectiveness claims based on Trial Counsel’s failure to object to Eileen Adriance’s, Corey Garnett’s, and Paulette Darling’s exclusions for cause also fail to meet Strickland’s prejudice prong.78 Adriance stated that she did not believe in the death penalty and said, “[y]es, sir, I would have a problem with that,” when asked whether her beliefs would substantially impair her performance as a juror.79 Garnett gave inconsistent answers. He initially agreed that, while he believed a life sentence was the only appropriate sentence for first degree murder, it would not impair his ability to recommend a death sentence if the law and evidence warranted it. Later, however, Garnett stated that he could not render a guilty verdict knowing that the defendant might receive the death penalty. Darling agreed that a person convicted of first-degree murder should automatically be given a life sentence and that she would vote in favor of it regardless of the judge’s instructions.80
Under these circumstances, Ploof cannot show that Trial Counsel’s failure to ask the trial judge to undertake further questioning, or to object quixotically to each juror stricken for cause, created a reasonable [831]*831probability of a different result.81 We reject the contention that an attorney must object to every potential juror dismissed for cause. That strategy would cause the attorney to lose credibility with the trial judge and hinder the attorney’s ability to raise a meritorious objection. Ploof has not shown that Trial Counsel was ineffective by failing to rehabilitate these prospective jurors or to object to the trial judge’s decision to excuse them, because Ploof has not established that the trial judge might have allowed these people to serve. Nor has he shown any reasonable probability that the trial’s result would have been different.
4. Ploofs Other Guilt-Phase Ineffectiveness Claims
Ploof incorporates several additional ineffective assistance of counsel claims by referencing his briefing in the Superior Court. For the reasons stated in Part III.B.2 swpra, we conclude that Ploof has waived these claims because he did not address these arguments’ merits within the body of his opening brief.82
D. Appellate Counsel’s Failure to Raise Meritorious Issues on Appeal
Because we are remanding Ploof s penalty phase claims for the reasons discussed in Part III.F infra, we next address Ploofs arguments that Appellate Counsel ineffectively represented Ploof during his direct appeal. Ploof contends that Appellate Counsel was ineffective because she did not raise all “arguably meritorious” issues on appeal. A defendant’s right to effective assistance of counsel extends to his appeal.83 Although the United States Supreme Court developed the Strickland test to evaluate trial counsel, we also apply the Strickland test to evaluate appellate counsel’s performance.84
Although a defendant is entitled to effective assistance of counsel during an appeal, this does not mean that his attorney must raise every nonfrivolous is[832]*832sue.85 A defendant can only show that his appellate counsel ineffectively represented him where the attorney omits issues that are clearly stronger than those the attorney presented.86 To determine whether a defendant has been prejudiced because his attorney failed to raise an issue on appeal, we begin by considering the issue’s merits.87
Here, Ploof argues that Appellate Counsel was ineffective because she only raised five claims on appeal, instead of all “arguably meritorious” claims. Ploofs Appellate Counsel raised five claims: (1) the trial judge erroneously admitted evidence tainted by a Miranda v. Arizona88 violation; (2) during voir dire, the prosecutor’s peremptory challenges violated Batson v. Kentucky;89 (3) the prosecutor’s reference to Ploofs “public defender” prejudiced him; (4) the trial judge should have bifurcated the sentencing hearing; and (5) his sentence was disproportionate.90
Although Ploof does not identify which additional claims Appellate Counsel should have raised, he cross-references other sections of his opening brief. Ploof argues that Appellate Counsel was ineffective because she failed to appeal the trial judge’s decision to dismiss for cause potential jurors who expressed their disagreement with the death penalty. Ploof cross-references the claims he attempted to raise by referring to his Superior Court filings earlier in his brief, and he appears to argue that Appellate Counsel was ineffective because she failed to raise those issues on appeal.91 We have already concluded that Ploof waived these claims. Because Ploof merely cross-references claims he has waived, we analyze only Ploofs claim regarding jurors dismissed due to their disagreements with the death penalty.
Ploof claims that Appellate Counsel was ineffective because she failed to appeal the trial judge’s decision to dismiss jurors who voiced objections to the death penalty. That claim must fail for the same reasons we rejected Ploofs parallel claim against Trial Counsel — the claim is meritless.92 Therefore, Ploof has failed to show a reasonable probability of a different outcome on appeal if Appellate Counsel had raised the issue.93 Because Ploof has not demon[833]*833strated prejudice, his ineffective assistance of counsel claim fails under Strickland.
E. Ploofs Constitutional Claims
Ploof raises numerous constitutional arguments, again by incorporating his Superior Court briefs by reference.94 For the reasons discussed in Part III.B.2 supra, Ploof waived these arguments by failing to address the merits of the issues in the body of his opening brief. These claims are also independently barred under Rule 61, because Ploof did not assert them in the proceedings leading to his conviction and did not establish cause for these defaults and prejudice resulting from them.95 Additionally, Ploofs Batson v. Kentucky96 claim is independently barred because we addressed that issue during Ploofs direct appeal.97 In order to invoke the “interest of justice” exception to this procedural bar,98 Ploof “must show that subsequent legal developments have revealed that the trial court lacked the authority to convict or punish him.”99 As the postconviction judge found, Ploof provided no reason to reconsider our holding (and failed to acknowledge its existence). He merely recites information that was available to both the trial judge and to this Court on appeal. Ploofs failure even to argue that the interest of justice requires us to reconsider our earlier holding bars him from rearguing this claim.
F. Did Ploof Receive Ineffective Assistance of Counsel During His Penalty-Phase Trial?
Finally, we turn to Ploofs claims concerning the penalty phase of his trial. Ploof raises several ineffective assistance of counsel claims based on Trial Counsel’s failure to investigate and present additional mitigating evidence during the trial’s penalty phase.100 The postconviction judge held that Ploof had not established either prong of the Strickland test based on Trial Counsel’s conduct during the penalty phase.101 He dismissed the prejudice argument by concluding that he could not [834]*834say “that any of the prolonged foster child information probably could have made any impact, even if presented.”102
In Williams v. Taylor, the United States Supreme Court held that the Virginia Supreme Court’s prejudice analysis in a penalty-phase ineffectiveness claim was unreasonable because “it failed to evaluate the totality of the available mitigation evidence — both that adduced at trial, and the evidence adduced in the habeas proceeding — in reweighing it against the evidence in aggravation.”103 We have remanded postconviction appeals in other cases to allow Superior Court judges to conduct a more explicit reweighing analysis.104 Although the postconviction judge’s analysis appears to be “at least an implicit reweighing”105 of the evidence, a more thorough analysis is necessary to allow us to review the decision. The postconviction judge had the advantage of hearing live testimony and is in a better position than are we to reweigh the aggravating evidence against the sum of the mitigating evidence presented at trial and the new evidence presented during the postconviction proceedings.
IV. CONCLUSION
For these reasons, we AFFIRM the Superior Court’s decision in part and REMAND in part for the Superior Court judge to supplement the record by reweighing the sum of the mitigating and aggravating evidence. Jurisdiction is retained.