Some thoughts on your list:As much as I like Nicholson, I do not see much improvement in his offense thise season.
Having been supportive all along, I have gotten frustrated with several things I've noticed (and I watch closely).
1. He doesn't establish position in the lane as an offensive option. Nearly every Big Ten post player has been taught how to do this. It doesn't look to me that the coaches are even trying to teach him this. He has the size and athleticism to get anywhere he wants to, including the low post, but he never makes a move to establish position and then look for the ball.
2. He doesn't seem to have great instincts as to how to get rebounding position. Our three point attempts tend to carom over his head. He does better on two point attempts, where the rebounds aren't nearly as huge. It doesn't look to me like he is getting a lot of coaching on this either. He doesn't normally make a decisive move to the offensive boards, but still gets some rebounds because of his size and reach. If the coaches can't help him with this, he might have to talk to Barnhizer and Martinelli.
3. I don't remember ever seeing anyone set a screen to free Nicholson up for a lob. Hard to understand why we can't do that. Easiest, most reliable source of scoring we have, other than when Buie can beat his defender off the dribble.
4. He gets his only opportunities on the pick and roll. I think the coaches believe that his entire role is to set screens all over the court to free up "shooters" that are less effective than he is at scoring. Nicholson is a very good screener, but I find it pretty sad that we don't seem to have a clue about passing into the low post. On the other hand, we love to shoot when he is 20 feet from the basket.
Nicholson's hands are fine. He handles the ball a lot and the turnovers are not bad - usually an illegal screen.
1) The 5 posting up isn't part of the offense for a lot of teams. Many teams prioritize receiving the ball moving towards the basket rather than with your back to it. Even if Nicholson had shown a knack for it (which he hasn't), I'm not surprised that isn't a part of the NU offense at all.
2) That ability will come as he gains more playing time. That's among the most difficult things to simulate in practice.
3) I would like to see more off-ball screens in the NU offense, but not setting those for Nicholson isn't surprising if you analyze the kind of offense NU does run. The lack of off-ball screens for non-three-point shooters is pretty common in set offenses.
4) I think it's actually an asset that the coaches have used Nicholson in a role this season that plays to one of his strengths. His size and athleticism make him a great option in high pick and roll action. The next step for him is finishing moves off that action other than dunking.