Most people believe that Kirkland being red John is to obvious, but I'm a firm believer of Occam's razor. Every time we see Kirkland it's related to RJ. The first time we see him is in the flashback which shows he has been watching over pj during his whole CBI career, when he meets and SHAKES pjs hand the red John theme plays in the background, plus he is shown killing of an RJ accomplice and he also got himself all of James RJ research which whould explain how RJ knew the seven names. He is creepy and intelligent which are defiantly two personality traits RJ whould have. I'm 99% sure this guy is RJ but heller is that brilliant you just never know.