There are quite a bit of things to consider for Nick's power. I can see where he could use it as a form of very shallow copy-cat powers. As in, he can't learn EVERYTHING about boxing from watching Ray. But he CAN learn some of Ray's moves. He can't just produce a boxing technique out of thin air from watching a boxer use a completely different move. 

Basically, if Ray uses a certain style of punching. Nick can instant learn what he just saw and use it with perfection. But he can only instant learn what he can see. He can't instant learn another style of punching if he has never seen it before. 

One boxing move does not equate all of boxing. Get what I'm saying?

And yes, it includes muscle memories, and yes it requires that the muscles required are present. Nick can learn how to lift a car, doesn't mean his muscles will be able to handle it. It's not a true copy-cat skill. It's instant intelligence. 


Does that sound about right? It's how it worked in my mind, anyway.