In the last episode Gale Bertram is the one and only who's requested to be Red John. The episode is classificated as the real truth about Red John's identity and it seems so. But there's one "mistake". Gale Bertram try to kill Patrick when he's in hospital. Red John never tried to kill Patrick! 

I think that Jane could be something close to a family for RJ.

I always thought about Walter Mashburn 'cause he has a real connection with him and his phrases are very very ambiguous.