Board Thread:Naruto Discussions/@comment-24165784-20151108230957/@comment-25122992-20151117145729

ET can't summon sealed soul cause it's mechanics involves summoning of the soul from the Pure Land, so it can't summon a soul, which resides somewhere else, although I don't know if Shinigami's stomach is the only example of such a place. Izanagi doesn't include limitations cause it actually doesn't summon the soul aka space-time, but makes as if it was just an illusion (along with the injury/destruction of the body/whatever that was the cause of the death) and the soul has never left the body. Thus it'd made as if the sealing never happened, albeit I got an idea that if the sealing would be completely undone, it can revive not only the targeted person, but the sealer as well.