Re: What if Muhammad Ali (Cassius Clay) never was?
Liston is the most interesting. He would have held the championship a while longer, I think, but the films show an aging and visibly slowing fighter. If he blew the championship in 1965 or 1966 to Terrell or Chuvalo or Bonavena, his reputation might be a lot lower today. With Sonny getting old, training haphazardly, and believing his own clippings, such an upset might not be off the charts.
If Liston might be the big loser, I see Holmes as the big winner. If Young doesn't get to Foreman, Holmes might have, and a win over a prime George would have been Larry's signature victory and cemented a position at least in the top four or so for even his doubters.