Due to being older, Opie has been the alpha cat but, as Rowdy matures, she is trying to take that spot. Opie is so laid-back, I think that he's going to let her take over. Opie, still lords it over Ike, though. Of course, a dog is way-y-y down the social ladder, to most cats.
When Rowdy gets to be too much, for Opie, he swears at her and bops her between the ears. He, also sits back and waits for her to eat. Of course, maybe he's just being a gentleman.