When Bertram turns out to be RJ  I'm going to scream "I TOLD YOU SO" so damn loud.
(Except if RJ turns out to be Reed Smith, in that case I'm going to cry so damn loud!!)

I think that in the episode 6 final, someone in the tyger tyger trio, I believe  Reed Smith, pulled the shotgun from PJ and shoots him, that's why we listen Bertram's scream "no". Because Bertram=RJ  doesn't want PJ killed (at least not by anyone else then him). Then they will hunt Reed Smith, probably make us believe RJ is him, and final, Bertram=RJ is revealed.

I also want to refer, that I re-watched season 3 finale and season 4 e01 and the mall thing doesn't prove Bertram is RJ as some theories present. As we all know by now, he belongs to tyger tyger
so even if he wasn't RJ he would be in contact with RJ, so when Bertram went to the mall with PJ, RJ (being him or not) sent Timothy Carter there, he just had to follow Bertram and PJ, RJ, even if not Bertram, would know everything Bertram knows. 
But the "rope" suggestion, it's another case. I think that clearly points to Bertram.

Just think, let's start by the contradiction (this looks like a math proof).
Let's suppose Bertram it's not RJ, then he would be at least an accomplice (tyger tyger), as well as O'Laughlin was, so Bertram (and in consequence RJ) knew PJ plans to fool him with at least two rooms. So what would RJ do? Bertram as CBI director was more valuable as an accomplice than O'Laughlin, RJ wouldn't be stupid and frame Bertram, the CBI director and such a valuable source of information, so O'Laughlin was the obvious guy to frame, but the only thing that lead PJ to O'Laughlin was the rope suggestion given by Bertram, notice that the assassin didn't went to O'Laughlin room first, now, are you really seeing RJ trusting Bertram (don't forget we are imagining RJ is not Bertram, so Bertram would not be the mastermind RJ is) to put that suggestion on PJ head?? PJ the smartest guy on earth after himself ? 
No..RJ wouldn't trust nobody else except himself to mislead PJ like that. Bertram, not being RJ, wouldn't be clever enough to do that, and RJ, not being him, wouldn't be stupid to trust him on that, and take the risk of loosing him as an accomplice and valuable source of information.
So, we came to a contradiction, RJ if not Bertrand, wouldn't want to frame Bertrand because he is such a valuable resource, he would choose to frame O'Laughlin, but to frame O'Laughlin he had to depend on Bertram's suggestion to fool PJ, and that doesn't seem to make sense. Meaning...the initial assumption of RJ not being Bertram is wrong. Bertram is RJ, he would be the only one capable of putting a suggestion like that in PJ mind and lead him to O'Laughlin.

The only problem with Bertram=RJ is that anonymous call, to you all that think it's Bertram, how do you explain the anonymous call?
 If the  anonymous call was made by RJ than the only possible explanation is that he was trying to lure Lisbon to him, but to lure Lisbon, he had to knew he was being tracked, because Lisbon wouldn't go to the house Brett was if she hadn't see in the GPS tracking system that Brett was there, so RJ had to knew that too, if was his intention to lure her.
But if he knew he was being tracked, why would he leave the phone stopped and so close to Brett house? So, if RJ is Bertram, the only possible explanation I see is that he didn't know he was being tracked, and that mean's he couldn't possible know Lisbon would go to the house Brett was, he was just guessing, if she was alone at the CBI she would probably go etc.. (but that seems bad writing to me) or better, it wasn't him that made the phone call, but then, who did and why?
Damn phone call..

I'm going to miss the find more clues thing and this site o_O

See you all

giga