Foreman easy by quick knockout,round or 2 at most Usyk obviously smashes Marciano Tyson beats Frazier mid rounds Lewis would beat Fury late stoppage.. The easiest fight to predict is Foreman v a guy with no heart and a glass jaw. If Foreman where around today with modern 'supplements' he would be 20 or 30 lb heavier and much more dangerous What Joshua did to Ngannou is what big George does to him. Levels
I don't know, but we have to remember that these are the best versions of each man. I'm not sure I feel Usyk "obviously smashes" Marciano, either.