Thanks for your reply @Dustyfeathers …in a very nice way you’re preaching to the choir at my house. 
We’re really big into playing board games and son loves The Adventure Zone, Critical Role etc too and aware of all of their professional backgrounds (he wants to be a concept artist for video games, films etc so follows alot of the creators in those fields).
But I do see the others’ point in that it’s hard to categorize since up until now he’s been a member but not a DM, so hasn’t really had any ‘leadership’ in this group AND it’s not a school club, just friends (an offshoot of the theater and tech crew kids where he DOES have a ton of leadership/involvement to put in Common App and on an a resume).
Altho I may float the idea to put it on his resume…thanks for the ideas/suggestions!