Calzaghe?? Man are you nuts?! While Ali didn't have a ton of one punch KO power, the man did KO George Foreman, floyd Patterson, Bob Foster, stopped Joe Frazier, etc etc etc. Those are no easy tasks my friend.
Man, if Ali could keep his guards down and beat Joe Frazier he could do the same against Holyfield. He kept his gaurds down when he wanted to (when he's moving) because he was athletic enough to make you miss. At the same time he knew when to keep his guards up (refer to his fight with Frazier, George Foreman, and pretty much every single fight when he's against the ropes).
Ken Norton is considered on the hardest punchers ever so there is no shame there. He would have KO'd holyfield imo.
Frazier is a much harder puncher than Holyfield. Holyfield doesn't KO people very often.
Yeah that's not the only way to beat Holyfield though, Ali is a fantastic boxer, obviously, and easily picks guys apart from the outside.
lol, come on now Ali was never KO'd in his career, well not until 1980 which was 20 years after he turned pro and waaaaaay past his prime. You're telling my that holyfield, a man with 25 KO's in his career, is going to KO Ali who faced some of the hardest punchers in the history of the sport and never was stopped?!? come on man, I know you like Holyfield but that's being extremely biased. Ali's chin is incredible, it's so good that's the reason he's all fucked up today (most men would have been KO'd by the shots he took but he kept going).
How you figure that? Remember Ali fought 15 rounds fights. His fights with Joe Frazier are a testament to how great Ali's heart is.