What if it's Grace's FATHER???!! I'm starting from the fact that every show has RED in the title. The only member of the team associated with Red is Van Pelt (hair). She is, however, too young to be Red John- and I think RJ is a man, so.... Van Pelt is the daughter of a football coach (from the midwest?) but what if she was adopted and never told?
Now one question flowing from this is does she know that RJ is her father? That could go either way...
If she DOES know, then she is working with him and is the mole inside CBI (shows up after Jane, in Pilot).
If she DOESN'T know, then RJ could be stalking her just as much as Jane...
Who knows!? One question to ask- what is MOST different between the case they investigate in the pilot and the one they investigate BEFORE the show has begun? (its safe to assume the Team investigated a case before the pilot episode, right?!) The introduction of Grace VanPelt to the unit. Her entrance is the start of the show.
(Either that, or Patrick Jane has an evil twin brother! ; ) )