We really don't know how good Tyson could have been. No question he was an unbelievable athlete. He was heading the right direction under Gus D'amato...but after his death Tyson was never the same fighter. His early career was filled with spectacular knockouts....but not against the best competition. You can argue that he really only faced two truly great opponents...Lennox Lewis and Evander Holyfield....and he got his ass handed to him both times. Now ,I understand that when he fought these two, he wasn't the fighter he once was...but those are still the two big names on his resume....and he convincingly lost against both of them. As for his loss against Buster Douglas....it was a combination of Buster having fought his absolute best and Tyson already being on the slide. The thing about Tyson is...that he was never a smart fighter...he relied on his athleticism to prevail all the time...add to that all the extra emotional baggage he always seems to carry with him....and you have a fighter that you sense wouldn't have the will to dig deep in a battle. As for Ali...his career speaks for itself. The Ali before his exile, was as good a fighter that has ever laced them up in my opinion...just a magnificent athlete. The Ali after exile was still a great athlete...but he also showed his incredible chin, iron will, and ability to rise to an occasion. He could win as much with his will and mind, as he could with his physical ability. Ali fought great fighter, including some of the hardest punchers of all time, and he won. Tyson at his prime would certainly pose a great challenge....but Ali had way too much speed and smarts.