I think Reede Smith is RJ. its just a guess and it feels like he's red john and "for" a fact, overweight people have easier access to high pitch voice which we have heard RJ use. Not to point any fingers but reede smith is a little overweight. if not reede smith i could think robert kirkland is RJ:
* he knows alot about agencies because he works with homeland security
* he stole PJ hole research to catch up with his suspects to later be revealed in the season 5 finale
* his and PJ first meeting: "you don't know me, but I know you"

but I still think its Reede Smith