Except we are talking about techniques directly derived from her eyes, the original eyes, the first eyes, and the strongest eyes. Not Rasengans, Byakagou, and Shadow Clones....Can they use Rasengan? Can they use Byakagou? Can Kaguya tell clones apart from the original?
Being far stronger doesn't validate the ability to use techniques that far inferior individuals have.
All of the eye techniques came from the original, which is Kaguya.