Its funny. Like many other Mentalist fans, I could present a holistic, exciting theory pointing out Brett Partridge to be Redjohn, incorporating intriguing and relevant information from season one to season six, while providing excellent answers to suspected plotholes. But if I say what I think I'll be murdered by a hardcore Brett Partridge hater who thinks PJ is RJ/Haffner is RJ/the list is fake.
So I'll just say this to those haters, on behalf of every true Mentalist and Brett Partridge fan alike:
"You irk me. You're irksome."
And if Brett Partridge isn't Redjohn, then we're all Britney Spears.