I'm not even sure if RJ is in the list but i'm sure EVERY person in the list will have a special relationship with RJ..But i want to say some things.

2-3 suspects are just there for episodes expanding like the Sherrif etc.

I don't know about the other but i want to speak for 4 people.

Kirkland: He stole the list after Lorelei's death so that means RJ knew from before that Patrick is doing a list and stuff. HOW? Start searching the people Jane told about the list.I suspect Lisbon but all the love stories fans will oppose me.I think Kirkland is after Red John too.I don't know why but i think he stole the list from Patrick and he asked Alexa (FBI) for infos so he can catch RJ first.So i think we will find a very deep story behind him soon. The scene in the hospital where Kirkland asked the RJ accoplice if he recognizes him is a bit strange tho.I think Kirkland was just a bait so we think we have a RJ suspect but in fact he is not! (++ Episodes for next season)

Brett:
Mhm..he fits the profile but he doesn't seem too clever to me.(Maybe he pretends to play with Patrick).I like how everytime he speaks to Patrick behind him is the Red Face but i don;t think he is mentally strong enought to be RJ. Plus he always seems a bit afraid when talking to Jane.

Heffner:
He dissapeared all this time after the Barn episode so we will have news from him soon. (Maybe the oldest friend of RJ).

Jane's Father.
Ye i know he is old,we dont know where he is etc etc..but he is the only one that could possibly know the happy memories of Jane.His motive for all these things?Dunno. I think we will see him too.Maybe he was hypnotized by RJ and he revealed Patrick's past to RJ.

Teresa:
Heh..(All people that watch the show for the love story please skip this). I know that she is considered a friend and the only person Patrick trusts but...look her face in every scene that RJ is the subject.Always a grin or a smile.She was asking like a maniac about the list everytime she could.She knew about the list from begin.So Red John may found out from her (video).I think and i want Teresa to be an accoplice of RJ.That or she is manipulated/hypnotized to reveal things.I think she will play a big role at the final episode.I think she is evil:P

Anyway thanks for reading write a comment of what you think and sry for bad english and long post:)