I think Colton has every chance to be a SOLID defensive defenseman. Shaw, too. Wolanin has the offense side down, but is becoming a liability defensively. That being said, these are ALL underclassmen. All of them have time to develop and saying their ceiling isn't very high is premature. Shaw is a former USHL d-man of the year and Wolanin is a draft pick. The talent is there.
Also, no way to know about next year's d-men until they get here.