Tyson would have destroyed ali, most of the fights in those days were decided by the mafia not the fighters. ali-liston is proof of that.
People say tyson was a bad bloke, but you have to remember he was from the streets and did no worse than your average chav does day in day out. i think he was badly done to with a fake rape claim and made out to be a monster when he was nothing more than a fighter and a rogue.
Bob sapp can only fight for two minutes and hes fucked, hes been chinned loads of times, he does nothing more than box and the occasional arm lock.