i am not convinced, well we know that RJ is a narcissist person and he certainty does not like anyone to get credit for his work..sooooooooo how about this:
1)the 5 suspects at PJ house, non of them were RJ because why would he blow him self up.
2)you see Bertram getting ready to travel and escape, hmmm not the personality of RJ.
SO my idea is: that PJ knew that Bertram is not RJ BUT he knows he is a tyger tyger, and Bertram is trying to kill him and stuff so that he doesn't get caught for his criminal acts.
4)so PJ does a press conference and says its bertram, knowing that RJ will NOT accept that, and it will force him out.
umm just a few ideas i had in mind.