First PLEASE stop looking at next weeks promo for clues. Just because it appaears as though Mcallister is not dead, does not make him Red John. Just because you THINK you hear Red John say "The Game is over I Win" does not mean that is even Red Johns voice. That wouold not be the first time Red John delivers a message to Jane through a messenger who uses the word "I" when referring to Red John. The network would not go all this way to give away such blatant revelations in the PROMO.....Now on to my theory.
My theory is more of a sit back and ask yourself a key question. WHAT IS RED JOHNS MOTIVE???? In the beginning Red John was depicted as a psychotic serial killer who just liked killing and torturing people, mostly women. As the series moved forward he slowly became a intelligent, manipulative, messianic figure complete with disciples, informants, and a network of followers. Now were supposed to believe he is the leader of a massive, very powerful criminal organization made up of law enforcement and judges??? Why would someone so smart, so powerful, so influential risk it all by getting his rocks off killing random women?
Either this show is completely jumped the shark and cannot reasonably connect season 6 to season 1 ORRR there is some other purpose for the Red John murders that carry some elaborate motive not yet explained.
Its my theory that Red John is NOT a member of the Blake Association, and in fact his motive is to expose it. Bosco and his team were not set up and killed by Red John, they were set up and killed by Blake Association operatives because the Red John investigation was leading them to Blame Association members. Every Red John murder including that of Janes family threatened to expose the association. Knowing that Jane would stop at nothing to catch him after murdering his family, Red John continued to lead Jane towards exposing the Blake Association and it worked. Bertram kept wanting to be there when Jane caught Red John not protect him, but because the Association wants Red John dead. Notice how the Blake Association members behave a little differently than Red John Disciples. Red John Disciples seem loyal, almost like they worship him, while Blake Association members are bribed or forced into membership. Finally I cant escape the biblical symbolism. Red Dragon, the picture of the last supper, a final showdown in a church, fire and brimstone. Does Red John view himself as a modern day Jesus revolting against a tyrannical regime complete with disciples? Even the episode after Red John has the word heaven in the title.
With this theory in mind I look at Stiles... If red John is NOT in the Blake Association, Stiles and Haffner were the 2 without a tattoos. Stiles for sure views himself as a Jesus type figure with his own disciples, close to death, who will return after his demise.