Human dynamics do not change on the pro level. They still have to have some form of cohesion among each other in the locker room and just overall as a team in general or more times than not it isn't successful. It doesn't mean everyone is going over to each other's homes after every practice roasting marshmallows around the campfire and singing hymns. But they do have to function well socially as a group to be successful. I've rarely heard of a locker room being in disorder and that team winning a championship.
