I think there is one massive question that most of these theories do not address and that is how RJ knew PJ's list of 7 suspects. According to PJ he did not share this list with anyone prior to the RJ video. I believe this is very important to finding out who RJ is. 

These are the only answers I can think of. If you can think of any other options please comment.

1) PJ fed RJ another fake list somehow. In this case RJ must still be on the list to believe that PJ is close and therefore it follows that Jane actually has a much narrower list than the 7 suspects. Jane possibly already knows who RJ is or he has only a couple of real suspects. This would explain Bruno telling us we can 'trust the list' and that RJ is definitely on it, but also explain how RJ got the list and his big mistake.

2) RJ guessed PJ's list because the 7 suspects were obvious to him. Remember all he knew was that Patrick shook hands with everyone on his list. So RJ must have worked out the suspect's names because he knew that they would come under suspicion. Why? The only answer that jumps into my head is the connection with Tiger Tiger. The 7 suspects are members of Tiger Tiger (one of these being RJ.) They would have come under suspicion as they are involved (whether knowingly or not) in covering up RJ crimes, and these are the members of Tiger Tiger who have shaken hands with Patrick.

The next question is about Kirkland. From episode 4 we are told that Kirkland is not a member of Tiger, Tiger and this does not fit with the above. However they have given themselves the escape option of a twin brother who could have caused Patrick to suspect Kirkland as he is involved with RJ crimes and cover ups. Alternatively it could mean that Kirkland (Bob or Michael) is RJ.

I was previously set on Partridge for RJ and I would still prefer it to be him. However because of the questions over Kirkland and his brother I now have 2 suspects - Kirkland and Partridge. It is also convenient that they are both 'dead.'