Board Thread:Theories and Speculation/@comment-26005711-20150719134117/@comment-26541067-20150903151709

but Id think a guy like madara always had a backup plan. even that uchiha from the flashback of the history of izanami instantly undid the deaths of his comrades when they were ambushed. i agree with your idea that maybe the bodies need to still be "warm" or fresh or intact or whatever. but i think gedo differs from edo in that edo simply traps a soul in a corpse vessel while gedo revives the corpse completely.thats why i think madara was still young when he  was revived instead of old like he was at the time of his death.gedo gave life to his edo body

as i mentioned in a flashback they showed izanagi being used to undo the deaths of a troop of uchiha