Why don't any of you man up and admit you were wrong to think Cus' death had anything to do with Mike's decline? Mike himself has explicitly said Cus never taught him any technique. He just talked to him for hours every night about boxing history and life in general.
Cus trained Rooney and Rooney trained Mike. It's as simple as that. Cus didn't even watch Mike fight, let alone corner him. He sat at home waiting for the phone call to know the result.
So, guess what happeneded when Cus d'Amato died in 1985? Nothing. Mike kept getting better and better until he fired Rooney. Yes, 1988 Tyson was BETTER than 1985 Tyson whether you like it or not so stop saying Mike's decline began in 1985 because it's just not true.