I agree that he needs to establish the muscle buster as a pinning finisher while the rear naked choke is already his submission finisher.
I read that Joe is also very protective of the choke in that he doesn't want anyone reach the ropes for a rope break, ever. Joe is of the impression that in a real fight, if the choke is put on you, you either tap quickly or pass out. Some have tried to soften his stance on it by saying it's pro wrestling and you should have people make the ropes to add dramatic effect, but Joe doesn't go for it, which I agree with. Keep it special.