Board Thread:Theories and Speculation/@comment-45345143-20200330202500/@comment-4961229-20200331071636

Boruto is more similar to when Kakashi was possessed by Obito's soul and gained all of his powers at the level that Obito could've used them. It's different than a jinchuuriki, but it's a similar principle. Konoha should've started a practice of sealing all their old warrior's souls into their young warriors so they wouldn't lose so much military strength across time. Kishi should've given it its own name, but that's an oversight on his part.