Come on you guys, it's so obvious that it's Wayne Rigsby.  How could y'all possibly even entertain the thought of it possibly being anybody else??!

Wouldnt it be a disappointment if Red John was Brett Partridge, given that he has the look and the voice to match Red John.   It would be too easy and predictable.  If Red John were Rigsby or even better yet Cho, now that would be a fun story as it plays out.  As for who my guess is, I like the posting earlier today about Amos Van Pelt and Grace being his accomplice, but who knows.

There is no way Sean Barlow can be Red John.
Lorelei said that she wondered why RJ and Jane didn't become
friends the first time they shook hands.
In the season finale of season 5, Sean Barlow refers to Jane as his
friend, hence Sean Barlow is not RJ since RJ and Jane isn't friends.

I'm just saying that if RJ has such great control over people, he or she could "make" the accomplice say anything about him. Lie about gender. Lie about height. Lie about it even being Patrick Jane.
Heck, it could even be Lisbon.

I am RJ. If you look the episodes you can see me always supporting PJ in his crazy plans without asking anything, that is beacause im judging, the way PJ thinks and how he finds the assassin amuse me. Why did i kill that girls? I had a crappy childhood. Why RedJohn? I like Red, is the colour of the fire, it relax me.

I think Wayne Rigsby is the real Red Jhon :) my theory is RJ love stuff that related with RED, e.g Blood, Red Hair ! as we all know Wayne like Grace VP (red hair), and also at season 5 episode 16 , lorelei said, RJ actually someone that Patrick Jane already knows, and she said, Jane should make friends with Jane, but we all know, that wayne friends are Kimball Cho, but not with patrick Jane! even wayne is not to smart on CBI, I think wayne only pretend so patrick can recognize RJ,

if my prediction right wayne is the real RJ! to be Honest ,I am not surprise :D lol

I think it should be mentioned the presence of red hair in the show.  When all of Rigsby's internet dating pursuits show up at the office, they all have red hair.  seems fishy to me... I'd be disappointed if it was him but it definitely possible that there's a link..