Guys,

The reviewer lady in spoiler tv, who already watched the 6 x08 episode almost explicity said that Red John is Sheriff McAllister. She confirmed that it is one of the 7 suspects on the list and she said "Don't overythink. The promo tells you a lot".  I love reading your theories, but at the end of the day , the sheriff puts the bomb under his hat, kills some of the suspects and appears again after Patrick announced a "fake" Red John deliberately. As simple as that.