I'm not really sure. It's hard to tell. As far as the 'public face' of the GB, it is without a doubt Morris. As for who runs the show in their meetings, I don't know. It could be any of them, really.
One thing I've found, and maybe someone can back me up, but it seems the guys who appeared to be softies were really the biggest assholes. Like, Barber seemed like a goofy old man and Barr talked like your perfect imaginary grandpa, but from what I've been told they were the real hardliners. On the other hand I've been told Jaracz was really a more moderate person despite coming off as a jerk.
Someone mentioned Splane earlier, and yeah, I've heard plenty of morning worships from him. The dude's a dick.