For as very young player it is almost always better to leave him in college(see Makar). Even the jump to the AHL can be a shock. Gophers ahve a very talented team coming back, with great facilities. It's not like he won't be playing against those 2-4 years older than him, even there. The AHL can get pretty raw, and IMO is sometimes more about survival than working on skill for a young player. You want Knies working on his skills and skating so he doesn't end up as some middle six grinder.
Younger/as young and smaller players make the (much steeper) transition from the CHL to the AHL every single season and thrive