Quote from Calibine
We think he's dead, and just set a justsu to have a cop of him appear when here's 8 tails, but masashi kishimoto might just pull a fast one and be like, he sealed himself along with the kyuubi...or something like that
he was sealed along with the Kyuubi!!! The whole death god jutsu seals both the target and the user's soul. This got explained a long time ago by Sandaime when he used the jutsu against Orochimaru
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