Well, i will not argue too much, this puzzle is a bit messy with false leads...

But IMO, if i were the author i will put RJ in the Pilot. Its like look bastards, you don't catch but he was there from the first episode.

That guy is Brett Partridge he was on first episode...He is not dead at all, its fake, we dind't see the body...
Who is dead is Partridge, but RJ is still awake, inside him.

And always is the forensics experts (like Dexter)... Its the only one, who can cover his tracks.

I betting on him from the beggining, is not now that i will give up.

Brett Partridge is Red John!