Another thought is that maybe the pubbies want it to be Spector who reads the political writing on the wall and decides to resign the Chairmanship, rather than push him out. They need to get Spector on the reservation and keep him there because they need his vote.
Your first paragraph is my fear. Check out Hugh Hewitt's thoughts as well, at www.hughhewitt.com.
My question would be: has a chairman ever been removed, as you suggest MacSpectre might be removed if he strayed? Mightn't the repercussions of such an "ideological purge" (as it would be reported) be pretty serious? I can hear the campaign remarks.
Dan