Board Thread:Theories and Speculation/@comment-25302335-20150914182027/@comment-734582-20150918134622

LegionZero wrote: Except that is inconsistent as well since Hamura was already on the moon despite Hagoromo still being relatively young. He would have had to summon and reseal the Gedo. I think it's better to ignore The Last and run with resealing, since that actually works with the most known plot points. Kurama et all probably did not gain consciousness until Hagoromo made them, so i can understand there being some misunderstanding and misinterpretation of facts that lead to different stories of how exactly the Juubi was sealed. However, Kaguya's actual memory shows them sealing the Juubi with Six Paths Chibaku Tensei, which i think supersedes other sources. Given that Madara could already summon the Gedo easily, it seems that the summoning contract already existed, and Hagoromo creating it makes sense.

The existence of the Gedo statue was likely a well-kept secret by Hagoromo. As long as it's existence was unknown, and the other pieces of Chakra were split and spread by Hagoromo, nobody would be able to recreate the Juubi unless they held his power in full. And since he left warnings on the tablet about recreating that power, his plan was essentially complete. And it would've worked if it wasn't for Zetsu.