Then they weren't OP were they... Edo madara=OP AS HELL, and if Sasuke was Edo, i doubt tiny tricks and pitfall plans would have foiled them like Edo Deidra. (and don't give me that "Edo Nagato should have been OP too" Edo nagato kept his "change of heart" through most of the battle, and wasn't sealed. His soul "came at peace" like the others.
So if an Edo truly was OP...then they would still be around, like Madara.