Originally Posted by Rock0052
6'3, 210, 6'2, 215...those guys still wouldn't be what I'd call big. Those are solid sized heavies, but it wouldn't give us a sense of what the Rock does against the big boys even if he'd faced Baker and Valdes. It would give us a better idea of how he'd do against an average sized heavy today, though.
This is the critical point.
If we match Marciano against a Klitschko brother in a fantasy fight, there are significant stylistic unknowns, because we have never seen him in with an elite fighter of that size or style.
Even if you don't think that Willard was any good, he was absolutely an elite fighter as big and durable as any of the curent crop of superheavyweights, and Dempsey not only beat him but anihilated him.
This absolutely has to be weighed in his favour when matching him against bigger fighters from later eras, as it should for Joe Louis and even Max Baer or Jack Sharkey.