Very difficult to narrow it to three. But even ignoring recency bias:
PJ got plain robbed, that was unique on the list.
Bo really dominated and if it were not for an opportunistic roll through by MM on his throw to the back, he wins going away and becomes our first 4xer. Then again I guess Miles could say the same thing 3 years later
Mitchell just lost track of the score. Giving up a riding time point is not the stuff of champions though. He may or may not have won if he knew the score, there was little time but he was on a Mitch roll at the end
For those three karma just swing the wrong way that day to snatch defeat from a victory, and one could argue each did enough to win but simply didn't.
DT had the biggest shock value, but in the end Bubba earned the victory, most painfully so.
All the rest, from memory, our guy just lost in a tough bout that if they went again may well have had a different result. Maybe Shane should be added, as many saw this year as his window. Next year will definitely be tougher, and for Beau to lose from rear standing is a real kick in the nuts.