Fighters who had a major weakness/flaw that kept them from greatness

[Sleepwalker]

Joe Louis was great but he couldve been bigger if he didn't have a personality of a tree.

He was more wooden than Keanu Reeves and Kneeguel Cotto combined, like no chaisma whatsoever.

Yet Sonny Liston got chastised for the exact same thing (aside from his mob ties).