That has nothing to do with if he controls them or not.
I doubt Kabuto was stronger than all his edo's combined. It doesn't matter how strong they are, it depends if they can get loose somehow. Itachi only broke loose through the use of genjutsu he rigged beforehand.
kabuto couldnt control madara
i dont believe the orochimaru has the power to control all the hokages . all the hokages are stronger than him .
what about madara
Will Sasuke allow the Kunai and tags to be inserted? Or would Sasuke want Orochimaru to have such control over them? It would seem Sasuke would like to keep both sides even to prevent Orochimaru from grandstanding and interfering with His plans.
It doesn't mean jack if they're stronger than him. They are under his influence.
I suppose you think Kabuto is stronger than every single Edo he brought back?