Nah, from what i've seen Naruto's only going to pull totally new Rasengan variations from his ass everytime he needs it. It took Minato, a once in a genration genius, 3 years to make the Rasengan, and Naruto spams a new one every 5 episodes. Besides, if Naruto learnt anything else, he wouldn't have enough time to create different Rasengan's. He only created new Rasengans because that was literally his only offensive ninjutsu. If he started learning Fuuton or any other type of jutsu's he would have to spam unholy amounts of Shadow clones and that wouldn't be ''realistic''. That's just my take on things. Besides Naruto's got Bijuu Mode, which I think Kishimotos been planning from a while. If he had learned any Kinjutsu it would have made Naruto ''overpowered'' :heh: . Again just my take on stuff.