Regardless of prison and drug use pressure fighters (which is what Tyson was) have a short time at their peak. 27-30 years old is just about the time they start to fall apart. Now Tyson had more power than most pressure fighters but again the way he was successful using that power was by being a pressure fighter, forcing his opponent to make a mistake, and throwing volume at him where a big shot was bound to land after a while.
Tyson never had many late stoppages and fighters eventually learn how to survive and once they learn that they'll try to win the late rounds, and once they do that, they'll try to win the early rounds and throw Mike completely off his game. Tyson's style couldn't adapt easily when guys started forcing him to work harder to get those punches in.
Bookmarks