Foreman didn't pull off five stoppages of his opponents during his post-Zaire, multi-fight exhibition, although he tried. Is there any heavyweight you would bet on stopping all 5 inside the distance where Foreman failed?
It was such a charade aha. I think Jack Dempsey could give it a go If I am not unfamiliar with my history he did something familiar with a longer span of time over the course of one night. @janitor would of course have the answer to If I am right on my statement Mike Tyson is an easy pick. I think someone like Moore could do it. Marciano could gas them out and just beat them into a coma.
I'm not sure that you'd need a champion for this. A high level contender with plenty of stamina and a record full of early KOs over journeymen might work. Crazy as it sounds, Wilder might do it.
If Foreman wasn't wasting time bunny hoping and trying to be something he wasn't he probably would have.
Tyson stands a great chance. Not many top him for bursting out of the blocks and hurt his opponent. If the guys weren't ex top notch then I'd put money on Tyson.
Tyson, Dempsey, Louis, maybe Liston Others with a shot, on a good day.... Tua Briggs (hopefully he gets some time between fights to rest) Wilder Lewis Bowe Cleveland Williams Frazier