Of course he trained with weights ... and of course he used anabolic drugs ... and of course he was naturally aggressive and muscular ...
Why does any of this even require consideration? If you have any clue, you know. Weight training for Mike was just that, weight training. It wasn't some all-intensive bodybuilding approach, obviously.
And as far as the whole MMA thing, Tyson would have been at a disadvantage in the sport, sure. Who wouldn't agree? But in a spontaneous real fight, my dough would have been on Iron Mike. In his prime the guy was too aggressive, explosive and talented with his fists to have been at much risk of having to duke it out on the ground. Within the first few seconds the foolish bastard who chose to pursue the altercation would have had holes punched into him. MMA hero or not.