Scarlett55's theory is absolutely correct and makes perfect sense except for a couple of stuff. You failed to recognize that Jane and Red John made the list of 7 together in advance so that Jane could fool the CBI ( through Lisbon ) that Red John is one of those 7 men. In reality both PJ and RJ wanted to bring down the organisation.Why would Patrick work with the man who killed his family? Because Red John did not...............tiger tiger killed Patrick's family and wanted to frame Red John for it. They obviously did not know that Jane and RJ were in contact with one another hence he knew RJ was innocent of this crime. Red John and Jane are probably close to one another and that's why Jane won't give him up to the cops........................probably because he knows RJ will be killed in custody by tiger tiger so first they take them down then Jane will betray Red John. 

Or Partridge the Zombie is Red John.