I don't have a problem with Green. He wasn't ready for the B1G last year, but he was a Sophomore so he has time to learn and grow. If he stays, he'll get more opportunities if he works at it. 6'6" and reasonably athletic will go pretty far in this program.
I agree. His jump shot release is slow, but there is the opportunity to improve that. He has shown that he can be accurate, if he can get his shot off, but this was his first year playing against Big Ten competition, so it's not that surprising there were growing pains. Unfortunately, it seems like he lost confidence in his shot as conference play was getting started, and then CCC benched him in favor of Clayton and others.
In non-conference play, he did show decent athleticism, but his defense wasn't great, which probably contributed to his benching for the latter half of the season.
Overall, I think there is still potential for him to be a contributor if he stays around, gets stronger and more used to Big Ten level competition. I predict that he will carve out a spot in the rotation, coming off the bench as the backup SG/wing for a few minutes a game, with CCC giving him more playing time if he can consistently hit the 3, but with a short leash if his shot isn't there early and he remains a liability of defense.