I have to clarify that I don´t speak english very well, so my apologies if you don´t understand what I said or if I´m wrong in a word.
I´m sure that Gale Bertram is Red John
Why?
Because he said a poem of William Blake when this was unrelated whit the moment.
Because he cares about what said the TV journalists about him.
Because he said La Roche that Hightower was in a relationship whit the policemam.
Because he wanted that Jane returns to the CBI, but he wasn´t interested in Lisbon (when was evident that Jane jad been the guilty of all) so he was extremely interested in Jane back to work.