Board Thread:Naruto Discussions/@comment-24165784-20151108230957/@comment-734582-20151117143533

Ravenlot 27 wrote: Of cource, it has to be activated before sealing process, actually I don't see the way it can be activated after. I think we have a slight mixup here.

It's obviously true that Izanagi has to be started before the sealing starts. But it "activates" or reverts the user after that. Madara did not trigger it until well after his death.

My point is, Izanagi could undo the Shinigami grabbing onto their soul, but once the soul is sealed then i don't see how Izanagi can undo it, since Edo Tensei can not summon the soul from the Reaper either.