Gale Bertrem may be on the list but i don't think he could be Red John.
Red John is a mastermind, he must be incredibally smart. He was able to basically browse Patricks mind. In the episode that showed the 'poker club' he kept losing and he couldn't even figure out why. He wasn't even able to figure out that that guy was calling his bluff! Do you really think a mastermind would lose at poker?
