Difference is that he was hit by a man 35 pounds bigger than the rock. I feel Marciano is an underrated warrior but we need to be realistic and think of him as a light heavy in the current era. Him vs Beterbiev or Bivol are better h2h matchups than Usyk who is Ali's size.
Usyk should be a big favorite in this one. His skills, size, and style would be too much for the lil fella.