There is no official NBA “what-if” ranking, and no statistic can measure the career a player might have had. The five cases below are ranked editorially by demonstrated NBA peak, how abruptly the career changed, how much prime may have been lost, and how uncertain the imagined alternative remains. The available evidence supports these five more clearly than a defensible top ten; padding the list with weakly documented picks would create false precision.
How to judge an NBA what-if
A what-if is not the same as asking who had the greatest career. Bill Walton, for example, won an MVP and championships; the question is what more he might have accomplished with better health. Other cases involve a sharp change after an established peak, a brief NBA career after high expectations, or a prospect who never had the chance to build an NBA record.
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This ranking weighs four things: what the player actually showed at NBA level; when and how the career was interrupted or redirected; how much prime opportunity may have been lost; and how far any alternative-career claim must rely on speculation. It does not assign imaginary awards, championships, or statistics.
The five strongest documented cases
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Bill Walton
Walton ranks first because the what-if sits alongside substantial achievement, not in place of it. He was an NBA MVP and champion, and his 1977–78 season shows the level he reached: 18.9 points, 13.2 rebounds, 5.0 assists, and 2.52 blocks per game in 58 appearances, according to NBA.com’s 2021 retrospective. The Naismith Basketball Hall of Fame also records his MVP, All-NBA First Team selection, Boston championship, and chronic foot and knee injuries in its Walton profile.
#1 Best Overall
NBA.com reports that Walton played in 44 percent of regular-season contests over his NBA years. That figure underscores the scale of the interruption, though it does not tell us what his healthy career would have looked like. His case is unusual: the unrealized possibility is an extension of an already elite career.
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Derrick Rose
Rose’s case centers on the contrast between an extraordinary peak and a career-changing injury. NBA.com’s retrospective describes him as the youngest MVP and identifies a devastating knee injury in the 2012 first-round series against Philadelphia as a turning point; it says he was never the same afterward. Read the account in NBA.com’s Rose retrospective.
Rank #2
The evidence makes the before-and-after question tangible, but it cannot settle what Rose would have achieved without that injury. A healthy future is a possibility, not a record that can be reconstructed with certainty.
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Brandon Roy
Roy demonstrated an NBA-level peak before his career was curtailed. NBA.com lists six years of experience and career averages of 18.8 points, 4.3 rebounds, and 4.7 assists per game on his player page. Those figures establish the quality of his production, but the page does not provide the injury chronology needed to quantify how many prime seasons were lost.
Rank #3
His inclusion reflects the combination of demonstrated ability and a career that did not run its expected course. A Sporting News retrospective also places him among injury-affected careers, but that secondary framing is not a substitute for a detailed, sourced timeline: Sporting News’ “All-NBA ‘What If?’ Team”.
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Greg Oden
Oden represents the prospect whose NBA career never developed into a long record. He was the 2007 first overall pick and played 105 regular-season NBA games, averaging 8.0 points and 6.2 rebounds, according to his NBA.com statistics page. Those are the outcomes he recorded, not evidence of a particular ceiling.
Rank #4
That distinction matters: a high draft position can explain why expectations were large, but it cannot prove what a player would have become. Oden’s brief NBA record makes him a compelling what-if, while claims about the star career he might have had remain hypothetical.
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Grant Hill
Hill’s case is a long career reshaped by adversity rather than a career that ended early. His official biography describes a 19-year NBA career and frames his comeback as a response to adversity: Grant Hill’s official biography. The available record here supports that broad account, but not a precise statistical comparison of his pre- and post-injury performance.
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That makes Hill a meaningful what-if, but a harder one to rank precisely against players whose peak and interruption are more clearly documented in the cited material. He is included for the contrast between a long realized career and the alternate version that better health might have allowed.
Why this is not a full top ten
Other names appear in what-if discussions, but the same standard of comparable, authoritative evidence is not established for them here. Len Bias is a distinct kind of case: he died before playing in the NBA, so his imagined impact cannot be compared directly with an injury-interrupted NBA career. Yao Ming and Penny Hardaway also appear in secondary lists and reader discussions, but those mentions alone do not establish a fair ranking against the five players above. A broader list would need verified records for each candidate and a clear basis for comparing different kinds of lost opportunity.
“Biggest” ultimately depends on the question being asked: Walton had the strongest proven NBA peak in this group; Oden’s case depends more heavily on potential; and Rose’s is especially defined by a documented turning point. No organization-published statistic measures the size of any player’s hypothetical healthy-career ceiling, so these distinctions remain editorial judgments rather than official findings.
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