Well, he's one of the last descendants from the old world; the Cus DaMato school of boxing. I think it's important to put this into some sort of perspective:
Tyson is mentally ill, and I don't mean that in a demeaning manner. Just like someone with a heart condition, he has a legitimate life-threatening illness.
It makes perfect sense that it's onset didn't start to show in his performances until he was in his twenties.
Perhaps the same can be said of Kevin Rooney as he's done many strange things and acted in bizarre ways over his career.
As to the legitimacy of Rooney's training abilities, I really couldn't say. He came from the Yale school of boxing theory under the tutelage of Cus, but I'm not
sure that it's made him a great trainer. He certainly has an abundance of knowledge to pass on, and it would be a shame for that to go to waste.