Board Thread:Theories and Speculation/@comment-1512913-20161122142914/@comment-4912646-20161129004606

Even if the events with Ten-Tails did in some way repeat themselves when Hagoromo was on his deathbed, it still wouldn't fix things. The databook explains the entire Kaguya/Hagoromo narrative in chronological order, and the creation of the moon comes right before Hamura departing to it (obviously) and the birth of Hagoromo's sons. Unfortunately, the one thing the databook leaves out entirely is Hagoromo becoming a jinchūriki. It just says that Hagoromo partitioned the Ten-Tails when his death was impending, with no mention of it being inside him. On the other hand, Hagoromo himself tells Naruto that he and Hamura sealed the beast inside him after their battle, with no mention of creating the moon (though it is shown later in that chapter, which was the first hint of a retcon).

So the two most complete versions of the narrative contradict each other, leading to the only possible explanations being Hagoromo receiving only the beast's chakra, or otherwise pulling it out of the moon immediately after it was sealed there. Either way, Toneri's version can't be correct, since it is just an expansion of Obito's version.