First, remember that only a half of Kyubi was sealed inside of Naruto. Yang Kurama is the yang half of Kurama that was split by the Fourth Hokage, Minato Namikaze. Naruto Shippuden 380 begins as Minato and his Kurama talk about about Minato realises that Naruto has changed.
The arc of The Fourth Shinobi War, in Naruto #640-677, sees Obito Uchiha effectively kill Naruto, by separating Naruto from Kurama.
Interlude. During Naruto's three-year training under Jiraiya, the Sannin began training Naruto to gain better control of the Nine-Tails' chakra, soon helping Naruto to master wielding the chakra cloak up to two tails.
Back during the Great Ninja War, Kurama was taken from Naruto to help out Madara and Obito, and the forceful action put Naruto on death's door. However, Baryon Mode actually drained Kurama of energy and allowed him to die.
There are two main in-story reasons for Naruto's relative lack of strength in the Boruto sequel series. Naruto's goal as Hokage is to protect the village, and this involves more than just learning new moves. Secondly, the ninja world is currently in an era of peace, which has made the villages weaker in general.Sep 26, 2020
1) The person who killed Naruto is someone with formidable power. 2) As a result of Naruto's death, Kurama would be free from the 8 trigram seal.Sep 7, 2017
4 Won't Surpass: Naruto Has KuramaBoruto does not have a powerful tailed beast inside of him. This is a source of power unique to the jinchuriki and Boruto is not one. Without Boruto having that power, Naruto can remain stronger than his son.
Naruto is far from weak without Kurama. He still has immense chakra reserves since he's an Uzumaki. He can also still use Six Paths Sage Mode, Toad Sage Mode, the Rasengan, Rasenshuriken, and might still have chakra from the other tailed beasts.
The Boruto manga just shocked fans by killing the Nine-Tails, Kurama, after the demon fox expended its chakra against Isshiki ÅŒtsutsuki in Chapter #55.
Konohamaru SarutobiMeaning he already meets one of the criteria to be a Hokage. He is not as powerful as other candidates, but he is still young so there's time for him to grow. The grandson of the third Hokage is well-known by other Jonin and the villagers. He may replace Naruto as the eight Hokage or as the ninth.
He got the Yin as well as Yang half of Kurama's chakra sealed inside him. So with both the halves of Chakra sealed inside him, Naruto would then have 200 times more chakra than Kakashi Hatake, one of the greatest Ninjas of the era. When Kurama died, Naruto got a massive nerf-down. He got 200 times weaker.
