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Also if im not mistaken the ritual used to turn them back needs the falmer to be mages or have a certain mana capacity for it to work.
These ones are crazy and controlled by vampire falmer.
Well he is a sage. Just people who try to become sages need at the minimum very high chakra.
Finally!!! I always expect noble families to train their kids and heirs properly with a proper systematic approach that not only nurtures their character but also their abilities. Most of these families are centuries old meaning they should have a proper education and development system for their heirs and children.
Logical reasoning.
But honestly that is the only chance, rather than small skirmishes a one straight blitzkrieg is the best solution.
Pretty much Sharigan precog is essential to pull that off.