It has now been nearly a year since this problem arose and it has gone unresolved. Currently, various articles on the wiki contradict one another on the matter of when and how the moon was created. The manga contradicts itself, with some parts claiming it was created by Hagoromo using Chibaku Tensei in his old age and others claiming he and Hamura created it together using the Six Paths — Chibaku Tensei. These are the various ways these events have been explained:
- Obito's initial explanation does not include Hamura and claims the Sage created the moon after the creation of the tailed beasts. The second fanbook repeats his explanation point-for-point.
- Kurama explicitly states that Hagoromo survived the extraction of the tailed beasts' chakra due to the Demonic Statue remaining inside him. Curiously, he also repeats Obito's claim that the extracted chakra was scattered around the world, seemingly contradicting the scenes where the young tailed beasts were seen with Hagoromo.
- Hagoromo simply tells Naruto that he and Hamura sealed the Ten-Tails inside him together. He does not elaborate on how it was sealed or mention the creation of the moon. However, the moon can be seen behind Indra and Asura in Hagoromo's memories in panels prior to the creation of the tailed beasts.
- Black Zetsu states that the moon was created when Hagoromo and Hamura sealed the Ten-Tails. He does not even mention the fact that it was sealed in Hagoromo.
- The fourth databook and movie guidebook repeat Black Zetsu's explanation as fact, stating the moon was created by the brothers' Six Paths — Chibaku Tensei. They also expand on this by saying that Hamura departed for the moon to watch over the Ten-Tails' sealed body. They still acknowledge that Hagoromo was the Ten-Tails' jinchūriki, though as far as I'm aware, neither explains in what capacity the Ten-Tails was sealed inside him.
So the question is what to do? Disregard Obito's and Kurama's explanations entirely? Simply mention the so-called plot holes in trivia? Regardless, there should be some sort of consensus on how to handle this issue in the numerous articles it affects.