Yes, I tracked IT last night as I was grading him and his defense was quite poor, beyond what I had the time/space to mention in the grades. It's almost as if many times he doesn't see the screen coming. You have to set yourself up to fight over the screen as the screen is being set. You change your path and get into the ballhandler to effect the ballhandlers path so you don't get rubbed off. Get hit by the screen and you've already lost. You actually have to defend against being screened. What I saw regularly was one of two results from IT.
A) Just flat out walked/ran right into the screen and stopped. Didn't fight through, didn't follow the roll man. Just stopped.
B) Went under the screen and just kind of stood in no-man's land. Didn't go under, then close out the ballhandler, nor did he track the roll man. Just went under and pretty much stood there.
In general he was playing too far off the ballhandler, either Dragic or Bledsoe. It wasn't just the pick & roll defense and stopping the ballhandler or roll guy, he also wasn't close enough to either to shut down passing lanes. That's also a problem given his size. It's easy enough to whip passes over his head but when he's also playing 5-7 ft off the opposing PG there's little pressure on the ball. Makes it much easier for the opponent to convert back doors or to hit a shooter in rhythm, which is what we saw last night. It's the opposite of what we see with his entry passes sometimes where the opponent gets into him and he has a tough time getting it into the post. IT's defense makes it easier for the opposing PG to make whichever pass he's looking for or setting up due to minimal pressure closing down the passing lanes/angles.
I think this is part of MLM's problem on defense. He's sagging off his man too far as he expects to have to slide over and help stop penetration, then due to being a rook and inexperienced he's losing sight of his man and isn't recovering fast enough, but the initial breakdown in the last three games has been overloading to help on penetration. It's partly why MLM has been a superior on the ball defender than rotating off the ball. Defense almost always starts at the point of attack and when that isn't up to par it effects everyone else, which is what we're seeing. It puts everyone else at a disadvantage. MLM's youth just compounds it.