All and none. The top three suspects on this site are ludicrous. Not only for sake of the fictional show but for the reality of real-world dvd sales, buffoons. If Jane is John Dvd sales plummet. There IS NO "RED JOHN." Stiles points to it but everyone wants to believe it is a single man. If there is, the minute he claims to be, he will be killed and that is how the whole fuckin series will end. There is NO Red John except what the cabal has created. The whole "serial killer angle" is just a distraction. Red John is a political cabal.