Hi , this is my first comment and i would like to apologize for my poor English.
Heller insists that one of the names on Jane's list is indeed his serial-killing nemesis.
If this is true the only one in list who fits ( by character) to be red john is stiles , but he is too old .  
I don't like to believe but since season 2 episode 8 (the flashback when R.J. kills peaks) i knew it was Partridge . i freeze frame and that long face and nose are Partridge's.
voice can be changed , poems can be read by everyone but that flashback was real RED JOHN . and again i don't like that creepy cheap guy be mastermind killer.