No theory here. Just wanted to share my opinion that the show has been extended far long to reveal red john. I think Bruno has made a mess of his storyline himself, especially with bringing up the 'Tyger tyger' organization all of a sudden in the 6th season (So as to keep the show going on after RJ is killed/arrested ---> $$$MONEY$$$ )

Its a fact people - whatever clues we are given, nothing is concrete. Whatever theories we come up with, Bruno can change Red John at any point of time. Its all about timing, expectation of the audience, and of course MONEY.