I don’t necessarily disagree with what your saying but you’re also comparing apples to oranges. Twenty-forty pounds giving up at HW isn’t much. Do you think Tyson could compete with Andy Ruiz? He’s giving up sixty pounds and four inches in height? By your estimation Tyson couldn’t compete. I think that’s absurd. I think mayweather could whoop a lot of people heavier then him....a lot especially at his best. But weight becomes less of an issue after 180 imo. You had great fighters that were top of the charts and were champions just over 180. Charles, Patterson, Marciano, Dempsey, etc how come they weren’t flattened by their larger contemporaries? And like I said There isn’t much to say Marciano can’t hang w those guys. He knocked out everyone above 200 meaning the extra weight didn’t really bother him. I think training today he would be heavier if he were competing at hw. would he be as good? Idk. But I’d not bet against him. So until you find proof that Marciano was bothered by big men you just have to go by what you got.