For a number of reasons:

 



1. In terms of the DNA found in the explosion, this
episode just established that Tyger, Tyger have resources at their fingertips
to call in a favour, no questions asked. It's conceivable that McAllister made
the call, as Red John or pretending to be someone else, asking for his DNA to
be switched in for the forensic analysis, and for the burnt crisp to be
identified as him. After all, if there truly are "hundreds" or
"thousands" of members of the Blake association, and this episode
showed that nobody could be trusted, I think that the positive DNA
analysis would be a very thin argument against his
survival.  

 



2. In terms of the explosion itself, he was
positioned (presumably still in the same position when the bomb went off)
alongside the other two suspects that survived, so unless he moved across the
room for some reason, the most you'd expect is that he would have been hurt by
shrapnel, but not burnt to a crisp like his supposed corpse.

 



3. General mannerisms during the confrontation. The
smile directed at Bertram and Smith as soon as his back was turned to PJ, the
fact that he was really the only of the three suspects with tattoos that shared
a brief conversation and moment of connection with PJ after revealing the
tattoo- looking him in the eye and saying he wasn't RJ seems like the kind of
thing RJ would consider a victory, if he managed to fool PJ once again. 

 



4. The actor's voice in other shows he's been in
has been shown to have the capacity to vary in pitch and sound quite similar to
the RJ voice.

 



5. For obvious reasons: the screen shot everyone
has of the 6x08 promo window break, and the nice Sherlock work shown in Theory #11952.

 



I would personally be quite happy for it to be
McAllister, not wanting to go over too much old ground with the whole Bertram
being too obvious now/Red Herring, and also that the showdown should always
have had that real twist to it, and this definitely would, much more so than
Bertram in my opinion. Although I do have to wonder at the people who put
together the promos for TV shows- unless it's a deliberate attempt at
misdirection by having McAllister in it, did they seriously not think that
people wouldn't be so eager to know the identity of RJ that they wouldn't comb
through the promo bit by bit?

 

Anyway, feel free to critique/criticise, I'm all
ears for other arguments. 

First thing's first, it absolutely broke my heart to see Patrick's teacup being broken and his couch being taken away! 

That aside, I am almost certain that it's not Bertram. Too obvious with the context of this episode, and also, he just doesn't fit my personal profile of RJ (and the show's profile of RJ!). 

I feel that if it's not Bertram, then it must be one of the 'dead' suspects. If so, was it really so far off for all the Partridge theorists, then? They suggested he 'wasn't really dead' whereas now I can totally believe that RJ could be (and likely is) one of the 'dead' suspects. Because if it's not, then it's Bertrum, no? I don't know. Judging by the comments thus far (and screencaps from the E08 preview), I'd say RJ is McAllister. 

One last thought. We were under the impression (from interviews and advanced reviews of the episode) that something/someone from season 2 was going to be coming back/revisited. Was that Rebecca? I'm a little confused about this. Maybe someone can leave a comment with an explanation. 

Thanks guys. Thank goodness we don't have to wait 2 weeks for the next episode. I'm SO NERVOUS for the reveal. I just don't want to be let down!

first :

Mcallister is not read john but he killed Patrick family and he came to ask for mercy from Patrick but PJ will kill him 


and why Patrick went to church cuz someone in the end of episode 7 give him little money and told him this is for you after that PJ face and think is changed and he leave everything and went to church  ...i think money is message to him ...



still no one of you know who I s RJ 

wow the promo is better than the whole last episode in my eyes.
we know that red john is rather old, but still not too old to run away from jane and he jumps through a window. so he has to bit kind of fit.

from the hair we can exclude all people but, mcalister, stiles (maybe cut them short), minelli (how long have we not seen him, maybe he got old in the meantime) and someone everyone has forgotten judge manchester. 

the hair fit all of them, but if we still trust heller with the list, only can be mcalister or stiles. but stiles is too old to run and jump like that.

manchester was not on the list, no one here could have guessed him. minelli was always suspicious but he was not on the list too.

and manchester would be too diffiucult to guess. but i think that manchester is a higher member of the blake association. also that dude from austin texas fbi has a hand in blake.

there is one interesting shot in the internet, where the guy who jumps looks like mcalister, also a pic where you can identify his hand.

but the voice fits manchester better than mcalister or minelli, even though both some how are close. stiles is not even close.

also manchester is really old to be a young man at the barn, he is the age of stiles, if not older.

Lisbon: Smith isn't Red John
PJ: That means we have work to do.

The normal dialogue should have been:

Lisbon: Smith isn't Red John
PJ: That means it's Bertram.

Seems like PJ isn't suspecting Bertram. Instead, announcing RJ as Bertram is part of the work he has to do.

By the way, who is the idiot that prepares these sneak peeks? Putting Mcallister and also his hand in it?

The search is finally over. I present to you the Red JOHN enjoy!!!
http://o1311.hizliresim.com/1h/l/unkm2.jpg

well i just sherlocked red john

http://p1311.hizliresim.com/1h/l/unkzs.jpg