I think saying that he wasted his talent is a stretch. I suppose with his natural talent and athleticism he could've learned to be more of a boxer and improve his technical boxing skills (not his "power-boxing" skills, which is speedy slugging).
I don't think Shane could've made 135 for that much longer. He has said that making 135 was very hard on him physically.
Guy has had a great career, I support and love this guys career, but most of all I respect this mans career. A lot more posters should feel the same its a shame if they dont