So Im not sure if anyone has said this or not, but it seems the only way for The Shinobi Alliance to stop Madara would be to resurrect him only to kill him once again and destroy all dna evidence of him. Of course the only way this is possible is with Obito sacraficing himself to bring him back and revert the Edo Tensei. But If he comes back does that mean he cant be summoned again through Edo Tensei because he broke the contract? Also since he is immortal can he still be brought back to life? Idk these are questions that keep coming up with the possibility of him being revived.