I actually believe Bob Kirkland's brother Michael Kirkland is Red John. I think Michael Kirkland actually found Bret Stiles when Bob Kirkland spoke to Jane about him meeting Red John. Bret Stiles either knowingly or unknowingly created Red John by taking him under his wing and trying to enforce the cult rules upon him. What happened at the barn all those years ago could have been Michael Kirkland unwilling to feel controlled anymore and thus acting out. The smiley face could be him finally finding happiness in his new found power.We know Bret Stiles has a connection to Red John already from his previous statements throughout the past episodes.