Who cares now anyways. Mixed Martial Artists, like the gracies, would destroy tyson in a fight anyway. Sure he could knock anyone out if he got a solid shot in, but he wouldn't against a lot of those guys.
He wasn't the greatest skilled boxer ever, he was one of the strongest/meanest ones though. His combination of strength and rage dominated boxing for years, till he met boxers who were skilled and didn't fall for that early trading of blows BS he sucked people into. If you look at his fight record though, he fought A LOT of chumps. He pretty much lost against all the top boxers he fought. I love watching him fight, because of his power, but as a pure skilled boxer, he was WAY WAY overated.