Board Thread:Boruto: Naruto the Movie/@comment-25139119-20150901144803/@comment-734582-20150903234719

Legendary Super Saiya-Jin 4 wrote: @Legion Cause that doesn't make sense. They want to get rid of the Ten-Tails, there is no reason to undo the seal placed on it and pull it's body back from the Moon after just sealing it away. Kaguya's power was too much too handle, and only Six paths: Chibaku Tensei could stop her. Once sealed, hagoromo can use Preta Path to drain it's power and eventually become it's jinchuriki. I mean, it's unlikely that Hagoromo just conjured Ten Tails Coffin Seal out of thin air. He also was the first Jinchuriki, which means he must've figured out you can be one in the first place. It's unlikely that Hagoromo just decided "hey let's seal this inside me" until he properly understood what it was going to do with him, and how he could do it safely.

What exactly he did with the Gedo statue isn't really clear, but it's possible he summoned it from the moon just to survive the extraction, then resealed it.