The most obvious choice for Red john is Brett Partridge....but that would not be a shock to many viewers and some may consider this a letdown after years of anticipation............We must remember that Red John is a showman and when he had first revealed himself to Patrick and shook his hand, he would have put on an act or a facade to hide his real self........If the writers want to give the viewers shock and awe on Red John's identity, then they should put Ellis Mars or Walter Mashburn as Red John.............Some may say that they cannot be Red John but if you just look back at their episodes, there are slight and subtle hints that they have the potential to be Red John......It will be boring and predictable to choose a person like Gale Bertram, Kirkland or Stiles as Red John....It will be somewhat unexpected if Mars or Marshburn is Red John....There is also the clue 'He is Ma', which could be indicative of these 2