It is not 700.5. It should have happened before 700.If Kakashi was the Kage for those five years then why isn't he at the meeting in chapter 700.5? Even Sakura is there.
Like I said transition of responsibilities. Some responsibility(I assume administrative , treaty etc.) here Naruto has to learn, he may assist. In other fields such as security etc. where Naruto is already apt, he may not need supervision. With time, all responsibilities got transferred to Naruto.
Sakura is just yhere beacuse Sasuke is. Assuming they are a a couple, it affects both of them. She is just there so that Kishi can show us Sasuke cares...