Spoiler: Kakashi revealed to Naruti to attain a jutsu that surpasses Rasengan he would have to learn chakra nature manipulation. The fact that Naruto is adept at chakra shape manipulation, proof being Rasengan, he will have to diagnose what element of chakra he produces naturally. The test resulted in wind as his natural element. He must now turn his Rasengan into a windy attack, Which Kakashi said is a perfect element for battle because it cuts.
Any ideas of what this ultimate jutsu is gonna do or look like?