Oh dear, have you not seen the pictures of their kids from the spoilers? These spoilers were released based on the movie, not based on the latest chapter. Because of that, these spoilers are from the movie and in other words Naruto's children are going to appear during the movie. Now, as I was saying the spoilers of his kids are too damn old for them to have been born when Naruto is 19. That being said there was a timeskip since their birth. Same goes for Naruto becoming a hokage, it can very well be covered by that exact movie. The last chapter shows us naruto being already a hokage but who tells us that Kishi didn't leave out the whole process of him becoming a hokage because he was planning to cover it in the movie?