I've already given my theory about Stiles being Red John.. But I have just had a serious thought.....:

What if Red John has actually infiltrated the Tyger Tyger group? (Implying he could be one of the 3 with the tattoo, even though that seems way too obvious right no).. He would be able to influence, or at least get a heads up on, any line of investigation of Red John or Patrick Jane! We know Homeland Security has been investigating Patrick Jane already, so maybe Tyger Tyger is as well, and we also know that pretty much every Law Enforcement agency is investigating Red John - so if Tyger Tyger is comprised of members of all the different agencies, then between the whole group, they know everything that has been found out about the to of them - meaning if Red John has infiltrated Tyger Tyger, then he truly is one step ahead of everyone!! Just a thought...