This is only one video, but it kind of goes along with what his other teammates were saying. If he really is like this I wouldn't be too surprised. Still a great fighter and entertaining. Definitely seems like a dick sometimes though.

When I was in HS I used to have a guy like this at our gym and he would these wild full power right hands when sparring intentionally trying to knock you out. But he usually would do it at times when you were getting up off the ground from grappling with him or when you were clearly gassed out and could barely keep your hands up. If he knocked you down he would gloat about it. He reminded me of those friends that press the same button on a fighting game over and over and then talk shit lol. Good times.