I think naruto can manupulate his rasengan shape apart from the usually round rasengan just like when naruto and yamato combined wind and water together to form a giant tornado againt the wind and fire tornado when they were figthing with two akatuski member who killed asuma.it was naruto that did the rasen-wind and it was not in a round form it was like in a circular tornado form and am sure naruto has more wind techique apart from rasen-shuriken