I think that the key is the interview with Bruno Heller talking about the list of suspects. Actually, he didn't say "Red John is on that list" but he said "We can trust that list".

The only logical explanation for using that sentence is that Red John is Michael Kirkland.

Let's think about it a second: if those names appear in the list is for a reason and I really doubt that Jane would make a mistake on that. And the fact that Red John comes to the same list of 7 suspects make me be sure that the names are there for a logical reason. So Jane could not be wrong about the list. 

However, he had not the information that bob kirkland had a twin brother, and red john knows that PJ didn't have this information. So PJ could have shaken hands with Michael while he thought he was Bob Kirkland.

So, if Red John really was in the list, Bruno Heller would say "Red John is on the list". So Michael being RJ would explain the "we can trust that list" 

im not going for bob i am going for michael,

first off why bring up a twin why not just a brother or hell even a sister

second he matches the description down to a t

i think when janes cup got broke it brought him straight back to kirkland

michael we know had a drinking problem and was reached out to and helped who said that was not red john but visualize and they sent him to the farm

and bruno heller said it was definitly the one of the people on the list but never said it was a character what if he meant actor???

i wanted it to be bob from the moment we met him and i think i would be happy for this out come if not i will be happy with either mcallister or shawn barlow

Maybe that was the clue for Michael at the end of s06e01:

http://imgur.com/iX4pWUf

Kirkland was in Los Angeles.
Michael is one of the seven archangels in Hebrew tradition.
In Hebrew, Michael means "who is like God?".

I think at this point, I’m not trying to figure out who RJ
is but, rather, what Patrick’s whole ruse is. It seems to me that everything I've
seen in the last 2 episodes from arranging the meeting of the remaining
suspects to the detailed report Cho gave Lisbon at the hospital to the FBI
clearing out the CBI have all been part of Patrick’s plan.

I re-watched the latest episode, paying closer attention to
the opening scene in PJ’s house. Something about the sly smiles and looks to
the side McAllister gives makes me think he was working with someone else,
someone who was outside the house.  



I’m not even so sure any of the suspects really died in the
explosion, just because the scene looked so staged. (I mean, c’mon a bare, cleanly severed foot just lying there? What happened to the sock and shoe? That’s one
discriminating bomb!) Like it was set up in a way for witnesses to have their focus
thrown off by random body parts so no one would wonder why half the people were
unscathed and the other half crispy.



From years of watching Dexter, I learned that you can NEVER
rely on promos! They are always edited to look like something major and
exciting is afoot, when in reality it’s just an innocuous image unrelated to
what you think is happening. So, having said that, yes, I believe it’s McAllister
we see jumping through the window in next week's promo; no, I don’t think that means he is RJ.  From the still he appears to have been shot.
And if you believe the promo, he met Patrick at the church, was shot by
Patrick, was chased by Patrick through the cemetery then crashes through the
glass door, in that order. But did it really go down that way?



Prior to the explosion at Patrick’s house, we hear “No! Wait”
before a gunshot that, to me, sounded more like a handgun than a shotgun. What
if someone in that room had a backup weapon, like many law enforcement officials
do? The “no wait” was a genuine exclamation because it was not part of Patrick’s
plan. (He often miscalculates whether people are armed or not). So the shot… maybe
McAllister pointing his gun at Patrick but shooting in the air as a signal for
his partner to detonate the bomb?   



I think the theme of Resurrection is key. RJ is going to be someone
“coming back from the dead.” So, who’s living the zombie life?... McAllister? It would seem as much, given the
promo for next week. Stiles? Perhaps…in
flashbacks or as his reincarnated self. Partridge? I certainly hope not!

Unfortunately, I think it’s going to be
Kirkland… Michael Kirkland.  It was the tea cup breaking that brought me
to him. The somewhat defeated look on Patrick's face isn't because he broke his
favorite cup, but because the bumped arm jogged his memory to when he first met
Michael who was pretending to be Bob. (05x07) Kirkland bumped into Patrick who
was holding his teacup. He said, “Sorry Mr. Jane” and Patrick asked him, “Do I
know you?” You can see the look on Michael’s face, realizing he had slipped up
in assuming Bob already knew Patrick.  



BH said RJ is “someone on the list” --- technically, Michael’s
picture is on the list --- and that we would be disappointed with who it is---the
evil twin cliche IS disappointing if you aren't watching a soap opera. 

Someone leak the episode please!!! i'm afraid that i die before i know who is red john !!!!!! anyone with early access comoooooooon 

Not accusing Kirkland, compelled by computer to choose him. 

A number of posters seem to have caught the apparent spoiler in the "Red John" extended promo. I have a screenshot of the going through the glass moment, but I can't post images here. Regardless, the image is clear enough, and if this is indeed RJ, then CBS have just made a mind-blowing blunder. 

I've been reading a bunch of good Michael Kirkland theories and I think I connected one more clue to him people have brought up the look on Patricks face when he seen the burnt arm of partridge that was his first thought about Kirkland using the blow torch to get information and that's why he paused then when he got bumped and dropped his cup he flashed back to meeting Kirkland both those clues connect and trigger him to go to the church.