What makes Madara think his izanagi is more advanced than Danzo's? I mean he has the same drawback of losing the light of one of his eyes.
What do you think Madara is using as a body? I mean apparently he has senju physical energies but he doesnt even have a proper human body. He has white liquid for blood and he can regenerate body parts using zetsu material.
Could Nagato have used Izanagi?