I had considered attrition when I thought about the theory. Unfortunately, there's no way to measure that accurately without more information.

Our use as soldiers is why I'm here. Catherine let Haruhi know something. Something very important. Third Party members revive the same way we do. The Malnosso, in order to keep them out of action, capture them after they are reborn and detain them in prison facilities.

I'm sure you were already aware of the rebirth factor of the Third Party.

But what this means is both the Malnosso... and especially us, have been fighting these battles all wrong.