I agree about the three dots beeing a membership indicator and idk but i'm still not so sure if RJ is one of these three people.
Maybe that's cuz my personal favourites are Haffner,McAllister or Stiles. ;D Not that they are my main suspects...it's just...i like the actor's. X)
Having no 3-dot-tatoo can also mean a Red John identity. Maybe the members have tatoo, but Red John (the master mind) doesn't have. He don't need those tatoos perhaps. Only his people have tatoos.
My opinion.
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thanks,
clever vamp.