Who is Red John?

Theories of Ahayton (1)

http://www.youtube.com/watch?v=8aYdXiWf9dM 

in this video at 1.45 at shows a letter that Rosalind sent Roy aka RJ. The First line is Dear Roy, i found this address on a business card of yours that i discovered in the back of the sofa. This means she was not blind at the time her and Roy were dating or the director's have put that in by mistake which seams unlikely to me because the episode was 1x23 which was written by Bruno Heller and directed by Chris Long who directs all the mentalist finales 

Argue on this theory or rate it.
plausible
unlikely
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