its not that. pull all Bijuus out of naruto. (Logic doesn't aply).
and naruto goes 1v1 he loses because he has no skill.
Naruto relied on his own powers up to where he clashed with Sasuke after team 7 reunion and sensed Indra in Sasuke. He did go fox mode when he lost control over himself but overall relied on his own training and friends. You say Naruto have no skill without Kurama, who is now his friend, but lets looks at a few others as well.
Madara who could never beat Hashirama in a 1 on 1 so had to take his brothers eyes and go get Kurama just to fight Hashirama where he died and had to use Izanagi to come back alive.
Sasuke who needed to use Orochimaru's pill in part 1 which not only gave Sasuke CM lvl 2 but increased his base stats as well. Or at the fact that both Sakura and Tsunade, Tsunade being the world wide expert on medic, stated that Sasuke's growth was not normal and that Orochimaru more than likely used drugs or forbidden jutsus to improve Sasuke's growth. The Sasuke suppress Orochimaru inside himself which made Sasuke stronger and gave him healing abilities while he had Oro sealed in him. Sasuke needed Itachi to plan his dead so Sasuke could get MS then left him his eyes for EMS. Sasuke needed Kabuto to help heal him with Hashirama's cells and his medical ninjutsu. Currently using the Sage's power to have his Sharinnegan.
Kakashi needs to use Obito's eye to fight opponents such as Zabuza, Kisame, Itachi, Naruto and Sakura in bell test, Deidara, Tobi with team Kakashi and Team Kurenia with Yamato as leader, weakened Sasuke, white Zetsus in the war, Edo tenseis, and others I didn't mention.
Kisame needed Samehada which is a living weapon as it has a mind of it's own and can choose to go to someone else as it did with Bee. Kisame would use Samehada to absorb chakra from his enemies' and their jutsus and can even fuse with Samehada.
Danzo needed to take Shisui's sharingan plus those from Uchiha's who died in the massacre. He was Orochimaru's benefactor who used Orochimaru's experiments to infuse Hashirama's cells into his arm.
Kakuza needs to take the hearts of others to use other elements besides his earth one, he relies on other's hearts so that counts too.
Kabuto and Orochimaru, do I really need to explain this one? For those who need the explanation, both added others to themselves to try and define themselves. Kabuto's examples are how he added Orochimaru's, Karin's, Suigetsui's, Kimimaru's, and the sound 4's DNAs to himself. He got that concept from Orochimaru who have been adding things to himself for years, such as his snake abilities (you can see the experiments in Kabuto's flashbacks where Oro took him to his lab).
Obito uses the Hashirama's DNA from white Zetsu's to keep himself alive, not have his MS lose it's light/go blind, gain more stamina. He then takes Nagato's/Madara's Rinnegan to use as his own.
The entire Alliance needed Naruto's chakra cloak to fight the Juubi because they couldn't without.
I see you added Sasuke OT but he relied on others just the same so take him off, Madara is top tier alone but even he relied on others to gain more power. Only Hashirama, Tobirama, Hiruzen, Minato, A, Oonoki, Mei, Current Gaara, Gai, Lee, Neji, Itachi, Deidara, and a good amount of others really don't need to rely on others.
Naruto never had control over Kurama and doesn't now, Kurama freely chose to help Naruto who is his host because Naruto respects Bijuus and see them more than just weapons. Naruto didn't just get the power and automatically mastered it, he went into intense training with Bee for a good while then he entered the war to get "hands on experiences" as Bee called it. Naruto is a guy who learns by doing, this was said by Jiraiya, Kakashi and Naruto himself to Bee so all of the battles Naruto been on for like 2-3 days with little to no rest isn't really him getting the power easily.
