To me, the list is divided in many parts:

1. People who have a major interest in finding out who RJ is- Kirkland (representing Homeland Security), Smith (representing the FBI), Haffner (representing the private area), and Bertram (who I don`t know whose interests is representing, given his weird conversation with Smith)
2. People who have a strange connection to Red John:
- Partridge is the fan (and probably one of his disciples)- he is always guessing wrongly when it comes to RJ murders, so unless he does it on purpose, I guess this could be a clue related to his death. Maybe he was working for RJ and he made a mistake. I did something wrong. I am just guessing about his death, this theory isn`t about that)
-Bret Stiles, who, to me seems to be a former mentor of Red John. He doesn`t agree with RJ`s behavior, but does nothing to stop it. I think he is feeling guilty somehow about it. 
-Sheriff McAllister - this man is very interesting and weird. Maybe he is RJ, but something tells me that he isn`t. Anyway, he definitely is somehow connected to RJ.

My point is, none of them seems to have the motive to be Red John. I`m not saying that you should agree with me, because, at this point, anything is 100% sure.  Anyway, it kinda feels like the writers are reading all these theories and introduce them into the story. The CBI Ron thing, the pigeons fear, all that seems a little too much for me. 
When Jane said to Lisbon "I could marry you off in an instant" he was actually looking very attentively at RON, like he was speaking with him. And like he was threatening him. Weird.