Yes, Ali was the greatest, the best, or whatever you want to call him. He would have destroyed Tyson, especially once he left Rooney. A properly trained and focused Tyson would be a greater test, but when all said and done, Tyson was a bully. If you have the guts to stick a bully, withstand the initial barage, and stick to your game plan, then doubt begins to kreep in each second. Ali was afraid of noone, had a great chin, could take enormous punishment to the body (george foreman), and won the psychological battle every time. Case closed!
Lewis would be interesting due to his size, but Ali was always able to handle bigger fighters. What he did to Cleveland Williams in his pprime was utterly incredible.
As for Jones vs. Calzaghe??? Right now, Calz will beat him easily. In their prime? Jones :jabbing: probably the greatest offensive fighter of all time ( at 160).