If you re-watch closely the 6x08 "Red John", you'll notice something quite unnerving... Something much worse than RJ being McAllister...

Don't get it?

It's that, basically, you can replace McAllister by ANYONE ELSE with the same scenes and dialogues... IT WILL WORK THE SAME.

Neither McAllister, Jane, or anyone else refers something specific to McAllister... It's just... random!!! It could have been whatever suspect you'd like, the pizza guy... the scenes would have worked the same!!

I really wonder if this episode was written without any suspect in mind, just with "insert random RJ guy" for McAllister scenes, and then 3 minutes before shooting the episode, some guy came and say "oh hey it'll be McAllister I've just called Xander Berkeley he can come and do the episode right now!!".

RJ from 6x08 was just a fraud. The only RJ who can be acknowledged was the RJ from 3x24. The guy had it all...