Who is Red John?

Theories of s6e1 (1)

what the hell is going on ? 
According to interviews Partridge is dead and Bertram gives that obvious dialog ? Only thing that he didn't say was :"I am RED JOHN" really?
But i have to say that I am really happy that now show is more about red john than other things.

Argue on this theory or rate it.
plausible
unlikely
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