Hi,
I just want to share some random hints, which can exclude one suspect ;).
1.) conspiracy
In episode 6.02 three of the suspects were talking in the office of Bertram about something. Bertram said it's about drug related crime. The three were: Reede Smith, McAlister and Bertram himself. This three persons are also the suspects with a three-dot tatoo.
2.) Rosalind Karker is a red herring
Why is Patrick Jane not gather the suspects, invites Rosalind and let her identify him? He knows, that she is not reliable. I would assume her as a deciple, thus excluding her hints. Thus, the theories based on this hints should be thought over ;).
3.) McAllister is out
As you know, Red John seems to have some phobia. It's not necessarly acrophobia, but some phobia ;). In the show it is pointed out, that McAllister has ornithophobie (phobia of birds), or at least pidgeons only. In episode 6.01 Red John kills Partridge and attacked Lisbon. However, in this spooky house pidgeons were in the room Partridge was killed and "discarded".
So, in my opinion McAllister is out as Red John.
Just some thoughts an observations. I would appreciate your comments.
ps: I'm not a native speaker. I hope my english is understandable.
