This is sport where only a tiny percent make it to the contender level. I don't think that talent is in every guy that walks in a gym. Look at Freddy Roach as a pro, he trained very hard, had a good trainer, could take a punch but couldn't beat a guy like Camacho.

You have people that haven't realized their own talents. You also have talented fighteres that are sabotaged by trainers or bad managers/promoters. But I guarantee if you ask most well to do trainers they'd rather have the fighter with a tremendous work ethic than Mr. Talent.