I don't think PJ is RJ.  I think RJ is someone who is close to Jane ,someone who you never expected to be RJ. Maybe is someone of PJs family,maybe is his dad or someone like that,someone who controlled everything from afar,and someone who have a good connections .. I don't think Bert is RJ it will be too obviously , person who watched 1 ep with Bert could concluded that he is RJ.