Not Kirkland, but a lot of guys are making this last clue out to be a falsity. The tatoo is the last piece of the puzzle guys. Eoghan Mahony even quoted "This is Jane's leverage" Whoever has this tatoo is RJ that's all there is to it. It's not a member of Tiger Tiger, it's RJ as the case is about to be solved. I believe Tiger Tiger is a seperate entity from RJ as Heller even said their is a whole new side of the story to be revealed once RJ is dead. So on this note my pick is either McAllister or Stiles. It's one of these two I will put money on it.

It's him !!!
I'm pretty sure of that :o

I feel RJ could be Bob Kirkland's 'TWIN' Brother.

Remember he told Jane that he had an 'Identical' Twin. It just got me thinking...
+ What is the need to kill Bob if he was going to jail, he would be harmless right?

I don't feel anyone from the List are actually RJ. Why would RJ put himself in the list (i.e. in the video with Lorelie)?
These are just the top dogs/disciples of his corrupt group. 

One of the most demonstration why bob kirkland is red john or red john's man when he killed Lennon ( which is Red John's friend ) in order to avoid talking with to Patrick Jane in hospital. We understand that in this episode, Michael Kirkland  was most likely kill him  passed to the side of the twin Red John. As well people relevant to Red John did you see me in advance that why he asked the his twin search ...

Again... Bob's twin Brother, Michael Kirkland, anagram: 'A- hack-mind-killer'

Bob's twin brother, of course. ;) 

First of all ignore BOB's picture..

None of the remaining 5 suspects is RED JOHN instead everybody are involved in the TYGER TYGER group some how....and u'll get to know later that the TYGER TYGER organization and RJ are not in good terms .... So PJ throws a bait to RJ by getting all the TYGER TYGER masterminds in one room so that RJ would take advantage hence the BLAST ... But of course PJ saves them all thereby revealing RJ is some one out of the list.