I don't want to discredit GSP's dedication, but I personally questions his motivation going into that fight with Hendricks, knowing that he was planning on retiring afterwards. I know GSP says otherwise, but to me if a fighter has one foot out the door, they probably shouldn't have the other one inside the octagon. A big part of the fight game is mental, and part of a fighter is thinking of hanging up the gloves, then they aren't 100% focused on the task at hand.