Honestly I think RedJohn is Virgil Minelli. If you look at the seasons that is as head of the brigade always has to go away, and curiously during these trips, RedJohn appears during the absence of Virgil.
Could it be to withdraw from the squad to devote all the time to Patrick?
The thought that Patrick Jane is RedJohn would be disastrous for the brilliant career of this series, so do not contemplate.
Sorry my text, Google Traductor :)
