I don't think he started loading until he was with Capetillo, probably after the Williams loss. Martinez was so green that Margarito didn't need wraps to beat him anyway. Though I honestly don't give a **** if people want to question his entire career up to the Mosley; he deserves no less.
It's all just slightly informed speculation though. You'll have Margarito fans claim that he never once tried to load prior to Mosley. I think they're dead wrong and that he doesn't deserve any benefit of the doubt whatsoever but nothing can be said with 100% certainty.
Its doubtful, it would be the trainer who influenced something like that, and Margarito was not with Capetillo until the latter part of his career.