Hello, 

I am new to all this! I have been reading a lot of the theories on here - all rather interesting. Some I believe are plausible, or have at least made me rethink. 

I truly believe that Red John could, potentially, be anyone. I believe the writing of the series has allowed for this to happen - that any suspect chosen would have some form of evidence against them. Whether that's "real" evidence or "Jane evidence". 

I do not think it is Jane himself. If this were to happen, I would stop watching. It would literally ruin the show. Jane, undoubtedly shares similar traits to Sherlock Holmes, and Red John is his Professor Moriarty. To have them as one in the same, would be have Luke Skywalker turn around and say "Actaully, I'm Vader" or Harry Potter turn out to be Voldemort. It's obnoxious, knock it off!

I also do not believe Red John to be Lisbon. This would go against the Lisbon-Jane thing. He trusts her, she trusts him. It's another fundamental element of the show that harks back to Sherlock Holmes. Lisbon is essentially Doctor Watson. 

Thanks for reading this, I do not even pretend to know who Red John is. But would appreciate feed back on what I have posted.