I think all those saying that Kirkland killed Lennon because he is out for revenge should watch 5.18 again. The way kirkland killed lennon struck me as a mercy killing . Look at the way he held his hand and his tone. Anyone out for revenge would not be this sympathetic. Also if he was out for revenge why wait this long? He had access to FBI databases, murder files and very good connections. Also why didnt he ask Lennon about RJ? I believe Kirkland is Red John's man based on his dialogue with Lennon.
My Red John suspects are:
Ellis Mars (His appearance could be a pretence)
Marshburn (But I highly doubt this because he is simply not disturbing enough)
A showman from Jane's past in (this is my biggest bet. This person might have been jealous of Jane's intelligence. This may also explain Red John's rough hands and his ability to overpower men mentally (O'loughlin) and physically (the man he killed in mexico) )
Harken (Not disturbing enough but fits the profile)
