if this leaked episode is the real thing then i can say with 100% certainty the bruno has no idea what he is doing. its so clear that originally partridge was supposed to be red john. the fact that people saw that made him throw some hack job together at the last minute to "prove" the audience wrong. the sheriff as red john makes zero sense.
ok it has to be brett. in the episode that kirkland kills one of red john's men, he looks him dead in the eye before killing him "do you know who i am?" "no" so that says kirkland isnt red john. he knew who red john was and would not have had such a clueless look when he saw kirkland. kirkland is red john's right hand man most likely but not red john himself.