Thanks, understood.
I do have that structure already for different reasons. Though not one "team set" per editor/edited group, but that's not the issue as I can prevent further "cross-group" editing with conditionals.
But, as confirmed by you, I must then make the editors full "CB Moderators" and, if I understand it right, that's a no-no due to the other moderator permissions they would inherit. As I already said in my initial post, "that seems a bit risky".
Too bad... guess I'll need to look into modding the core