I will try to explain my thinking process to you here:

I'm starting with the little fish Reede Smith:

as we all know he is part of the tyger tyger organisation and he killed Bob Kirkland. I will exlude him as a potential red john since he doesnt seem very smart, and it would be a big disappointment to be honest if its him.(plus i think Red john doesnt like the Tyger Tyger organisation~I will make points clear at Ray haffners part)

Sheriff McAllister:

It is very possible that he is Red John, since he saved Jane's life on the roof of the church(it literally felt like mcAllister was protecting Jane all night long)

Do you remember the meeting mcAllister, reede smith and bertram had? I think all of them are part of the Tyger Tyger org. (pj walked in and said he is close catching red john) reede immediatly saying to bertram that's his duty to find out more informations.
I know I did say Red john doesnt like the tyger tyger club, however there's no reason for him to not be in this organisation to gather informations and to kill people that come too close to catching red john)

Gale Bertram:
(he has always been a suspect from season 1 on until now. i will try to explain why i think it is or is not him)

if you can remember JJ. Laroche was looking for someone in the CBI who gives out informations(in the end i think it was the redhead press chick, which doesnt exclude someone else playing for a other team)
i think bertram is part (or some sort of head) of the tyger tyger organisation as stated earlier

But same thing i wrote about the sheriff could be true about bertram.(TygerTyger and/or Red John)

In my oppinion there are 2 options which leads me directly to Ray Haffner:

When the boss of lisbon (the very young, smart guy) was killed by the FBI in the limousine in the final of season 4(because they thought its red john in there), he got replaced by Ray Haffner which gives me those 2 options.
As we all know Ray Haffner is part of/and working for Visualize and in the recent episode there was a personal investigator(that girl that looked like a less bitchy version of summer) hired from someone who did end up getting killed(by red john) and pj found out about the tattoo.

I think that girl got hired by TygerTyger and Red John ended up killing her because he kind of protects patrick (and lisbon). So its either:

(Bertram is Red John) and gave his friend Ray Haffner the CBI job(who does go and kill for him-see next episode when we are about to find out that ray has the tattoo(in my oppinion :) )

or (Bertram is only a Tyger Tyger member)=> Ray Haffner did get the job at the CBI, he then left because he's either taking Red John's orders or he is Red John and found out that Bertram is a TygerTyger basterd who he hates( would explain the kill onto the female private investigator and partridge(might have been a tyger tyger member aswell, but i have another theorie about Partridge aswell in his section)

Bret Stiles:

I really don't think it is him because first of all I think he's way too old and literally EVERYBODY knows him. How can you be undetected for so long by being that famous...doesn't make much sense for me.

Bob Kirkland:
He is dead and he was also looking to kill Red John.

and last but not least Brett Partridge:

It might be that simple and obvious as it seems, he is dead.

However it's not like how we can exclude Bob Kirkland(we did see kirkland getting killed and we only did see a bloody Partridge)

It might be he's best and last trick; everyone thinks he is dead.
because we didn't see him getting killed, nor did we see the dead body(please check again episode 1 and 2 if you think otherwise)
And that's why he did knockout and paint a smilie face onto lisbon(to get patricks attention onto lisbon and not partridge[himself])

In my oppionion this would be a worthy ending(or Bertram being Red John)

I hope i could give some insights of what I'm thinking and tell me what you think 

: )

Brett Partridge: Green
Someone else: Red


Out of everyone who's ever been on the show, he's the favourite. But does he have a majority?

First, how often does Jane give any information about any suspects until he has all the evidence. I believe the list is a test to everyone. He knows Lisbon wouldn't allow him to have 7 names and work on it himself. Everything he does is to see how everyone reacts or how they feel about it. So here's my theory.
When Jane goes on air and humiliates red john and red john strikes back in retaliation to me that says its an alpha male type person who wants to assert his dominance. Being able to draw a smiley face in the victims blood shows some kind of disregard for death and is not in the slightest squeamish. The therapist that red john went to seeking information on Jane said red john was holing back. He had some type of phobia or post traumatic stress. Cho was special forces. An elite group like that wouldn't be squeamish and would be extremely proficient in stalking prey and gathering intel. They are a very tight knot group which would be greatly benificial to being red john. The special forces unit patch displays three lightening bolts which if a woman could barely say tattoo then I doubt the dots were an accurate depiction of his tattoo. I believe it simply meant something in a group of 3. On the left shoulder. The left shoulder on an army uniform is where the unit patch is worn. So if he needed to throw suspicion off himself he could have someone from his old team or someone who he paid off. Not many people are trained in the art of self preservation like special forces. Or doing recon like their life depended on it. Only someone who is a complete sociopath could be able to lie to Patrick while having a straight face. Or someone who rarely shows any emotion. Which cho does. Also the first murders were on women I believe and a few men but mainly women. When a soldier receives a letter from their significant other about leaving them or adultery it is called a dear john letter. It's not far of a stretch that a special forces person who has severe PTSD that received such a letter would snap and kill. Hence the women targets. Also personal information on such army personnel is very sensitive information to keep them from being found out and risk an operation. Which could be why they couldn't connect them to any one jane knows. Being in special forces would also provide you with high ranking officials as contacts which over the years could have developed into any number of government officials.