Something interesting that I thought of that *maybe* hasn't been mentioned yet or maybe it's been "overlooked" :

Remember when Madelaine Hightower rescued Patrick Jane from Bob Kirklan from his brother's barn and told Patrick to only contact her after he's killed Red John to let her know that he's dead so she can come out of hiding?

Why hasn't he contacted her yet? Been well over two years...

Something to think about... ? Or just another "clue" that will never be answered amongst the other ones?