I dunno, he is one of the best defensive fighters of modern time, He will have forgotten more than most fighters know in a lifetime.

I don't know if he would make a good trainer as he is too used to being the star of the show himself, and a good trainer is always in the background, seen but not heard etc.

Hopkins has also been a difficult so-and-so, and he may find it hard to deal with a fighter who realises that he is employing Hopkins rather than vice-versa?