So he was playing with/against high level Euro high school talent. Like the US AAU circuit. The best college conf in the US will definitely be a step up for him.

Bosko is different, my understanding is he was playing at a pro Euro level, but not in the top leagues if I understand correctly. So he likely played with more experienced guys than Demin, but Demin was probably playing with the earlier-blossoming more hyped youth. I could be wrong on that.