None. I've always been a believer that when you get to the pros, you either have it or you don't as a player. Most NFL teams run variations of the same playbook, teach the same concepts, and go over the same drills. I'm not saying that players don't get better or worse but I think it has more to do with player repitition and learning as the game slows for them. I think that coaching has very little effect besides concepts. Just my opinion