You don’t find Redjohn by deducing who he can’t be. You follow the clever, wrapping plot that leads to him and enfolds him.

This theory is for Partridge fans and fans of Patrick Jane. If you don't like Partridge, think of it as an alternate storyline. If you already read my theories, skip the first 3 paragraphs. It is very long, I warn you.

If you say Partridge is Redjohn, we notice Partridge is really irked in the desert by flies. They buzz so loud in that scene. We must say that's mild acaraphobia- fear of biting insects. When he's finished talking to Patrick, he looks like something just went badly wrong.

If you're saying Partridge is Redjohn, we must also say his name means something. "Brett" for son of "Bret" Stiles and "Partridge" indicating he is the appointed leader of Tiger Tiger. Bret Stiles originally formed Tiger Tiger 25 years ago. Jason Cooper in Red Barn said 25 years ago, "Police never took reports from Visualise seriously." That's perfect motive for Visualise to form Tiger Tiger.

If you're saying Partridge is Redjohn, there are big questions that need answering. 
 

Part 1: Desert Rose


Partridge's dilemma

4 years ago, Agent Bosco got a lead on the Redjohn case. Partridge knew it would help identify him. Partridge, however, has no idea whether Bosco, who dies, told Jane this lead. At the end of the episode Lisbon calls Bosco a "damn-fly agent". That is not a Lisbon thing to say, so I conclude rather abruptly and crazily, the intel is something that indicates RJ doesn't like flies.

In the desert, Jane isn't thinking straight. He's angry. The case about Cody Benbow freaked him out. If you want to know why, read theory 8291. Yes... I wrote it. 

Ok, back to Partridge. So if you read theory 8291, you know why Jane is extra pissed while staring at Partridge, a RJ suspect. The anger is clouding Jane's mental sharpness. He does not immediately recognise that the flies are irking Partridge and does not connect it to Bosco's intel. At the end of the scene, Partridge looks like he just dropped the ball. Partridge recognises Jane was angry, because he planted the Cody Benbow case. Partridge also knows he may have just given the game away, and that IF Bosco told Jane the RJ lead, Jane would figure out his identity very, very soon.

Partridge is at West Huron all day, if you look at when they first bug the suspects.
Partridge realises there's no sense in risking Jane hunting him down on the same day, so he kills that identity. Redjohn kills Brett Partridge. He is the leader of Tiger Tiger, of course he can fake his death. Oscar Cordeiro, the EMT who arrived for the Private Investigator is RJ's man.

Patrick's ONE UP!

Patrick Jane later connects that RJ is Brett Partridge. He phones Lisbon excitedly like 3 times. But then he finds out RJ has Lisbon. Then Patrick forms the base of his ultimate plan: He will pretend he never heard that info from Bosco, and pretend he doesn't know who RJ is.

He drives to the scene. He needs water; he takes Partridge's blood. And he looks extremely concerned for Lisbon, in order to avoid checking Partridge's body. This way he can keep up the facade he doesn't really know who RJ is.


Part 2: Black-winged Redbird

Patrick goes into the meeting of 3 suspects, and uses suggestion. He plants the word "bugged," near the end of his speech, and talks about Sophie Miller like RJ made a mistake that would help uncover his identity. Patrick is still acting. He knows who RJ is.

Partridge is still in a dilemma. Does Patrick know, or doesn't he know? Partridge sends someone, a spy, who looks just like him with make-up and red hair and red fingernails, feeding pigeons. HE'S EVEN WEARING PARTRIDGE's EXACT WATCH!

Patrick sees the spy, and is deep in thought. Patrick doesn't take the bite. Instead, he lets the spy overhear that he thinks RJ will have left a file because he must have visited her in person. Patrick really knows she had a vocal recorder. RJ doesn't know this! But its no help to Patrick, since he already knows his identity.

Part 3: Wedding episode

Patrick pretends Sherriff could be a RJ suspect. Lisbon even tests the "acrophobia," another misdirection from Patrick... He is surprised that an accomplice would save his life though. Very surprised. Bigger question: How does Sherriff know to go to the rooftop, and what kind of escape plan involves going up a rooftop. Was this guy hypnotised by Redjohn? I mean he's shot dead so we'll never know.

When the pigeon flies up. It's like Partridge saying "You're welcome," to Patrick.


Part 4: Kirkland dies. Or does he? I have no idea. Kirkland could still tell Patrick about "Tiger Tiger and other interesting info," if Patrick visited while he's detained.


Part 5: The Red Tattoo

Partridge is still wondering if Jane knows who he is. When he bugs CBI, he'll probably hear Rigsby talking about Haffner as an RJ suspect. Then, he purposely bears his tattoo while he's killing the Private Investigator, and makes sure Oscar Cordeiro, the EMT sees Jane's reaction at the scene. Jane continues his act! He leans in close to hear the tattoo clue and wipes away the bloody dots convincingly.  No doubt that Cordeiro will report back to Redjohn, telling him about this. Then Jane finally has his leverage. Partridge will think he's unknown.

Part 6: Jane can manipulate the clue, to pull all 5 suspects, including Bret Stiles, RJ's father into a room. RJ will expect Patrick now to do this, but now thinks Patrick doesn’t know who he is. What happens next? Wait and see.