I must be seeing something completely different than you guys. Jesse had a few nice plays on defense in the first half, but essentially it was GT playing like they had been - as if there were no resistance inside. Jesse stood tall with arms a couple times and they ran right into it. Good. But he is so weak that there is literally no chance of him collecting a contested rebound. When he gets the ball, opposing players are looking immediately to take it. And they succeed a lot.
I like that he does keep his arms up on D and doesn't "roof" over players which always garners a foul call, but he is unaware in several of his zone responsibilities and is frankly just too physically weak to play right now.