This last episode is called The Great Red Dragon. In the Book of Revelations the great red dragon refers to the final one world government. For the show this could refer to the blake society. The Dragon has 7 heads (the 7 from Janes list). The Bible tells that one of the dragons heads (referring to the antichrist) is wounded, appears dead then appears to be resurrected. Brett partridges face isn't shown when Cho checks the tattoo. Not to mention brett is the only one with build and sound of voice as red john. I believe he faked his death with the help of the blake society.