It's almost always a good move to get this feedback and it can help a kid realize he needs to get down to business and help his game if/when he returns to college. IMO he clearly has the second most NBA potential from your roster last year (not saying he was your second best player or best team player that's a different thing).
I don't think he is close to Morgan. It's a shame morgan had to play 2 years primarily in the post and likely didn't really get to develop his perimeter game at least I expect that is case. I don't really know what happened in the practice. Morgan has a nice all round skillset and IMO, playing in the paint in the Big 10 proves some toughness. He doesn't have elite athleticism but I think his athleticism is underrated. He kind of reminds me of a Jae Crowder type of player. Whether he can realize that potential who knows. I think he'll put in the work to improve his game and in the strength room. Some team may draft Morgan if they know he will sign a 2-way contract.
Maybe Green will change my mind in his senior year. He is clearly athletic enough to make it but his atheticism will not be an advantage in the NBA like it is in college. He is like a poor man's Troy Williams but Troy has elite athlecism even at the NBA level. Maybe Green makes the NBA someday but my guess is if he does, he will bounce around lesser pro leagues for a few years unlike Troy who is bouncing around from NBA team to NBA team taking up one of the final roster spots.