Well first of all i think it's a great series.My theorie is based on facts.It is impossible that any of the crew or even Patrick(saw this posted with a spilt personality factor) could be Red John because at the end of the last eEP series 3 Red John kills the secretary(his acomplice) on the hallway of the station while the whole team is upstairs filmed in the same place.We get a slight look at RJ's back that lokks very much like Kirkland(hight weight and hair)2nd ofc he has acces to all the files all the facts about the cases and if he can compete with Jane intelectualy he could have figured out the list.The List is not bogus(the director states we can trust that list).If we watch all the scnes with Kirkland we find the one he shackes hands with Jane the first time and it is obvious the director wanted us to notice that.When he and Lisbon interview L.Martins mother is also a scene where he gives away nhis true nature.(take a look at his mimics).It may also be the case he has got more surprise accolites and some even on Jane's list.