I have a theory based on some notes
                                    let's begin...

"Robert Kirkland , Reed smith and Gale bertram are friends, i mean, one team".
     In fact:
In S05E05 "Red Dawn"
-alexa shultz with Robert Kirkland (in Limo) ask Virgil Minelli vie phone to keep her in loop about Red John's  case.

in other scene:
 Robert Kirkland is a "friend" of Gale bertram -may be just for work- anyway they both ask Teresa Lisbon if jane mad a progress on Red john case.

In S06E02
-in the meeting between 3 suspects : Gale bertram , Reed smith and Sheriff thomas mccalister, Reed ask Gale how jane is close with little authoritarian Voice.

Now we have two cases:

1) Robert Kirkland , Gale bertram and Reed smith cooperate with the aim of finding Red John before Patrick Jane find him.
    In that event, that let us think that may Raymond haffner or sheriff Thomas mccalister is Red John and is protected and invested somehow by Bret stiles.

2) Robert Kirkland is himself Red John and helped sometimes by his team Gale bertram , Reed smith and Bret stiles of course due to the fact that he was involved in "Visualize" and "the farm".

I hope that those things make a sense , and i think all fans and participants for their nice theories.