Board Thread:Theories and Speculation/@comment-26005711-20150719134117/@comment-734582-20150902201904

RikudoSasuke wrote: no no thats not what i meant. im wondering why madara didnt use izanagi to un-ghost izuna since im thinking he probably knew the jutsu at the time. because Izanagi needs to be activated first.

I think there are two ways Gedo Edo Tensei works. It can either revive all the recently deceased (like Nagato did) or it can return one dead being from the afterlife entirely. the difference is that all the people Nagato killed were still warm, and in many cases were called back from "limbo" (the campfire dimension, so to speak). In the other case, it's essentially a complete Edo Tensei.