no he probably didnt. but i think its obvious he does that on purpose. It has nothing to do with his legs. If he wanted he could explode on this guy at any moment, he's just taking it easy on him.
He did this with Cotto, Clottey, and from sparring videos. This is not something he does on "purpose". It's part of his style now at this weight class, like it or not. And against a volume puncher like Margarito with different angles on his uppercuts and punches, this is going to hurt him.
lol if it's part of his style, then how is he not doing it on purpose? Is it not his choice to stand there like that? He didn't do it against Hoya and Hatton did he? He's just playing phycological warfare. Letting his opponent know they can't hurt him. I think he'd be better served health wise not to do it , but if he can get away with it fine. I don't expect him to stand in front of Margo like that though. He'll be on the outside using his feet like he did against Hoya.
Its obvious he is playing in there. Look at 2:51, Pac gets him good with a straight left, opponent is completely open and pac is standing behind him with his hands down. The guy has amazing footwork and ring generalship.