I'm in the process of researching this for a potential article. Right now I have a cohort of a dozen of his NWMS players. That cohort, collectively, shot 39.6% from three point range as freshmen and 42.2% as seniors. So they improved by roughly 2.6 percentage points over the course of their career which is roughly average for a college player. KenPom did an article on this some years ago looking at all four year D1 players over, like, a twenty year time range and found the average improvement to be 2-3% as I recall. So nothing out of the ordinary for BMc in terms of Year 1 to Year 4 improvement. What is striking, though, is that cohort making 39.6% of attempts as freshmen. He is either recruiting great shooters or getting extremely rapid improvement so that they become great shooters in Year 1. Several of these players redshirted which probably factors in as well.