lol man i read your post and imagine your ava was saying itHagoromo told Kurama to go back inside Naruto. He accepted like the good dog he is.
True but kurama being combined was kind of a big deal ever since the hokages were revived. I just figured he would have made sure to show us it.Kishi doesn't need to show us everything that happens in naruto sometimes,he expects us to deduce and understand certain things on our own.Its obvious that both the yin and yang kurama are now complete in naruto's body.