[quote=@RaeoftheLight]
I'm wondering if groups should form based on ability, or based on how the characters interact?
[/quote]

I'm thinking it'd be a combination of both, maybe? I'm not sure who'd be choosing the members of teams in-universe (I'd guess teachers, though), but to make strong groups that work well together to minimize the risk of failures and injuries, both aspects would need to be taken into account.