Board Thread:Naruto Discussions/@comment-24898250-20140730025315/@comment-3038994-20140805190432

Are you referring to Sage Art: Lava Release Rasenshuriken and Sage Art: Magnet Release Rasengan? Naruto wasn't used to handling any nature transformation other than Wind Release, much less advanced types. So it's understandable that he needed help. Kakashi, on the other hand, has the two for most of his lifetime.