<p>That logic makes no sense. Every student has a teacher. By your logic anyone who learned from someone else isnt smart. There is a reason why in school, there are smart students and dumb students. Just because someone teaches you something doesn't mean you understand it. Intelligence is the ability to acquire, retain, understand, and apply knowledge to either gain new knowledge, decuce things, trick people , plan, and use forward thinking. Naruto from episode 1 showed intelligence, he stole the scroll and casually learned how to do an S rank jutsu. Naruto outsmarted neji, outsmarted kiba using wisdom, outsmarted kakazu, used intelligence to free kakashi from zabuza'a water prison, tricked pain a few times. He also learned how to do rasengan in a week after jiraiya showed him it once. Kakashi did his job as a teacher and showed naruto the basic principles. But naruto had to do the rest. Like I said kakashi himself couldn't figure out how to add the chakra nature, and he was impressed by how fast naruto was learning. That's intelligence. Sakura and choji also compared his intelligence to shikamaru. So really, all the evidence in the manga depicts him as smart. Using the shadow clones to help with sage mode was intelligence. He knew from prior training shadow clones transfer back experience to the user, so he took that concept and applied it to his new training. Kakashi wasn't there to tell naruto to do that, naruto clearly is able to absorb and apply knowledge, and that's intelligence. Naruto isn't dumb he is just goofy, just like jiraiya. That databook stat, wherever you got that from, directly contradicts the manga, where several characters outright marveled at naruto's intelligence. You are not giving credit where credit is due
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