What's going to happen to all your "spot on" theories when you actually realize Partridge is dead and McCallister gets killed?
My thought? RJ is Mashburn and Kristina Frye was his 3rd wife, as he mentioned in season 2 that his third wife was "really into that stuff." That's how Frye left the bedroom, because Mashburn came and got her.....or had one of his FBI, CBI, or police buddies get her.
Watch the episodes of season 2 and 3 that he was in and actually listen to what he says about himself, his thoughts on life, etc.....He is spot on for RJ.