Just consider this, whoever RJ actually is they have to have very set characteristics. You all remember the blind woman who had a relationship with Roy? That seems to implicate that he has a way with women if he can manipulate a blind woman into liking him...for me that eliminates the dude from the pilot who everybody wants to accuse because that guy is socially awkward. Also, RJ likes Patrick, is it too wrong to assume that Patrick wouldn't like RJ himself? I don't think so. Patrick and Mashburn got along pretty well the first time they met (and just a little sidenote, the fact that mashburn slept with lisbon opens up an avenue of possibilities if this is the case). At first, it was too obvious that Kirkland had something to do with RJ from his first scene on the show but it's hard to actually picture him as RJ. Oh and this should eliminate the theory about the dude from the pilot...Patrick never shook his hand.