That performance is honestly heartbreaking - one of the saddest things I've ever had to witness during the 15 years of my fandom. Jon is trying so hard, but it seems like his whole body has run completely out of gas at this point. His technique is basically non-existent, he's shrugging his shoulders and tensing his gut/diaphragm all the time (which makes hitting the notes even harder), gripping the mic stand as if he was dying.

Poor guy. I feel very bad for him, even though I think he (at least mostly) caused it all by himself. Had it been because of Richie/psychological reasons, he definitely would've gotten over it by now as it's been almost six years since his departure.