I like Weiler-Babb so do not take this wrong... But I would not call him an efficient scorer...
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Of the guys in the rotation last year, he had the worst true shooting % of anybody but Holden.
True shooting percentage is basically a measurement of the points you score relative to the shots you take. Guys who take/make a lot of three point shots, have a high 2 PT%, or draw a lot of fouls and make their free throws (or some combination of the same) tend to do well under this. That is "efficiency." What points do you produce from shot attempts?
Matt and Naz were super efficient because they took a lot of threes and made a ton of them. Solomon was efficient because he took few shots, but most of them were likely point blank dunks or put backs, so he was efficient even without much volume....
I think he (Nick) will improve greatly, particularly if he ups his 3 PT %, but I do not really see a case he was an efficient scorer last year based on the above.