Anyway, the correct answer to this thread is "his mum, when he sells his violin to buy a pair of boxing gloves".
Foreman, Lewis, both Klitch brother due to the sheer physical advantages " coupled " with their abilities. Unfortunately JL has no answer for the hit and move 67 Ali and quite frankly gets embarrassed by him. As Joe set up his combinations Ali would have stung him with a couple of lightning fast jabs then danced away again. Joe's foot work was positively sloth like compared to that Ali. Sorry if that sounds disrespectful to a great man, but that is just the way it is.
I think this is the first time I've ever seen Smokin' Joe Frazier placed in the "slower punching behemoths" group.
The smallest behemoth in heavyweight history! I don't rate Frazier highly head to head against many ATG heavies but I give him a great chance of getting to Louis early.
Mobile boxers who can survive the storm when Louis turns it on. So not very many but I'd have to think the likes of Ali and Holmes win 2 out of 3. Not that they are technically better than Louis but they'd have the points style and Louis was too measured and not programmed in the madness (Frazier, Marciano type) to beat them. His beautiful punching could fell the likes of Walcott and Conn but at their best the like of Holmes and Ali were nigh on impossible to break inside 15 rounds and would survive the storm.
Because of his punching power, you can't really rule out Louis against anyone. However, against someone like Ali - surely one of the most "unknockoutable" heavies ever - I don't think he can be favoured to do the job. Ali is all wrong for him, IMO. Holmes is another one who might outbox Louis - while I would give Liston, Foreman, Tyson and Lewis a decent chance of stopping him.
He would certainly have a chance of stopping them (Wlad and Lennox, anyway). Doesn't seem likely though (wouldn't bet on it).