I think part of the problem is expectations and ‘idealizing’ the roommate possibilities. With most of S’ friends (he is in a single and it has been the best decision ever - friends with everyone on the floor but has his own space) it seems they are just okay at best. Have yet to hear a story where they hang out together - well, maybe for a few of the girls but not for any of the guys. Also starting mid-year is tough. In the fall everyone is looking to make new friendships and then I’m sure they get a bit lazy about reaching out to new people.
As has been noted and as you agree yourself, it’s not a great situation but not horrible either. Hopefully he can join some clubs or intramurals to make friends. I think this is an important part of being happy at any university so he just needs to focus his efforts outside of his suite.