Who is Red John?

Theories of choandjane (1)

What's the significance of Cho telling Jane that he is acting crazy like the early days?
It felt like a really random line, very out of place.
I would give my own theories as to why, but I have only one.
That is to say that RJ is still alive, but there have got to be other possibilities. 
I just can't think of any.

Argue on this theory or rate it.
plausible
unlikely
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