All connected RJ associate exposed in the previous episode did not have the 3-dot-tattoo, why now ?
BH tried to ruin Mentalist but not to end it ?
On the other hand, why on earth somebody so stupid to expose their identity to others with the easy-to-be-spotted signature ?
Did they swim ?
I think its highly unlikely to be Patrick for a few different reasons. One, there happens to be a couple episodes where Patrick and Red John are actually in together. For example, the one where Red John recites a poem in Patrick's ear. Or where Red John slips a note under Patrick's hotel door and he chases him down. I disagree with the theory of Red John actually being Patrick.