Could you explain how you came to this conclusion? 25 GCU to spare seems like a lot to me.
Because they are offering money at a much higher ratio than it is for us.
Additionally, a 25 cube GCU surplus isn't
that huge. If Kyubey hadn't dinged us for violating the masquerade we'd have a 35 cube surplus.
That's with us paying the max for grief spiral negation, and with us refusing to take any risk in hunting, and us generally refusing to straight up fight to take territory. (Yeah, we aren't perfect, but we show way more restraint than most girls.)
Nor throwing out girls when territory is small.
I think there is a good chance the core girls are only 25 girls or so. Maybe with a lot of 5 to 10 girl vassals? And some of those vassals, having smaller vassals? Some of those vassals would be more trusted and more loyal than others.
Low feudalism, not the late high feudalism where the king had enormous power, but a time when the king would have to met in council with his earls/dukes and persuade them to support his wars.
Basically the 25 girl group is more of a balancer hegemon rather than pure dominance. Which would also fit if Hina is a telepath. Use telepathy to make sure girls aren't planning betrayal...
Dang, what a power the Corleone Family would have been with that power...
They could probably call a larger number than us into an offensive war, but not double. However, I better they would completely outnumber us if we started the war.
Would explain why they were so swift in returning our girls and exclaiming a misunderstanding. A 60 girl group, with almost all vets or elites, fully integrated into one organization, and so rich! It would make them very very wary.