Just want to throw something out there...as we know william blake plays a role in the storyline. Tyger, tyger is his poem and the great red dragon is his painting. I looked up the painting - there are 4 of them, and they were drawn to illustrate the book of revelations 12 and 13...I see a lot of possibility for revelations 13 to match up to the story line. A dragon and two beasts - could that be rj, visualize and tyger, tyger...or perhaps Ardiles, tt, and rj.... 7 heads, each blasphemous - 7 suspects. All who worshipped the firet beast should be marked (3 dots). A wound that appeared lethal, but was healed (partridge OR whoever survives the bomb blast)...seems to be more than coincidence to me

If Bertram is Red John then how come he allowed his inside man(O'Laughlin) to get killed?  When PJ realized it wasn't Bertram in the mall Bertram could have told O'Laughlin that PJ figured out it was him.  Presumably Bertram would want the inside man killed so that he wont speak just like he did with all the other inside ppl. Bertram couldn't have thought that they would have killed him.  Wouldn't he have warned him to get out of there and then maybe kill him himself?

last scene of the series, RJ is revealed to threaten Bruno Heller's life thus forcing him to give away a false red john.

This is probably unlikely, but I'll go for it.

I'm not sure who red john is but I'm predicting that perhaps as the list of the RJ suspects starts to decrease until there say, 2 suspects left, RJ will strike again but this time the victim doesn't die, or doesn't die immediately so they can give all the information PJ needs put together, and RJ will not be one of the 2 people, but someone who we'd never suspect, but has always been on our good side, which will have us shocked and talking for days.

Why does everyone believe, what Rosalind Harker said about RJ. I mean, it is obvious, that she was just part of a plan by RJ to mislead Patrick.
Otherwise you have to explain, why RJ made so much mistakes in that episode.
RJ ordered the skywriter as RJ Solution. So he must have expected that Patrick will go to the skywriter and ask, who ordered that picture and that this will lead to his postbox with a letter from Rosalind it.
If it was not RJ's intention that Patrick finds Rosalind, then he just made a couple of mistakes.

If RJ really is in the house with PJ and the other 4 suspects then he's ballsy to get that close. A question I have asked is why would RJ show up knowing Patrick is so close to catching him and may have a trap set. If Rj is Bertram then it wouldn't be the first time that he'd allowed PJ to paint him into a corner and bring him right to the edge of being caught. It is very similar to Season 3 finale when he goes to the Mall with Patrick even though Patrick suspects him of being the RJ accomplice.

The only suspects I've completely ruled out are Smith and Kirkland. I don't necessarily think Bertram IS RJ, this was just a random thought. LOL, I'm all over the place with who RJ is. Today I'm actually leaning towards the Sheriff, tomorrow I'll probably think it's Haffner.

I don't know who Red John is.

My theory, Red John hasn't showed up the "meeting" that made by Jane.
Why he risk his own life by the bomb?

Inoticed something. Daniel Cerone and another writer said RJ is one of the list, but they did not tell that RJ is remaining of the suspects. This is interesting.

Maybe Red John is Partridge or Kirkland? I don't know, but it easily happens.