As for Shackleford: There are people, members of his forum, that you can tell instantaneously that he doesn't like. He may put up with them for a while, while he looks for a reason to get rid of them. Redietz is among that club. So was BillRyan. So was even coach belly. I think when he banned CB, shackleford actually stated something about wanting to get rid of him for a quite a while.
I have no idea what would trigger such a first opinion non like of someone. But I believe one such thing is he doesn't like other real players and AP's that undermine him and know how things work. he really wants to be the go to guy that is the expert that every one looks to. He puts up with it for a few that he considers friends, but he really wants to be the top fiddle guy, IMO.