Re: Tobi is Izuna as an edo tensei, summoned by Madara before his death.
Madara knew Edo Tense revived him as soon as he saw his hands.Ummm, no. I mean, I'm pretty sure Edo Tensei was a technique (probably in prototype-form) that only the Second Hokage knew at this time. I don't think Madara knew nothing about it. Of course, there is no basis for this hypothesis but imo I don't think Madara knew about Edo Tensei when the Second Hokage came up with it. And he probably thought it was the Outer Path that made him come back to life.