It's all one big misdirection. We are not down to 3 suspects. Red John isn't Reede, McAllister or Stiles.

What If the entire Tyger Tyger group is Red John. Hear me out.
The Tygers commit crimes and make it seem as if a fictional person named Red John commits these crimes. No one could of course catch this killer as he doesn't exist. It's just the entire group of Tyger Tyger.

It's a group so there will be accomplices, allies, people to do the dirty work for them.

+Other: Jane is going completely off and thinking RJ is part of Tyger Tyger so next episode is looking for RJ within the Tygers because he believes RJ is part of them and should have a tattoo.
The person who killed Kyra with the tattoo was not RJ. RJ wouldn't do anything like that, we just believe what is fed to us which is that that person was RJ.