I don't agree. Think movies, amine and fillers do count but I rewatched the anime to see why people say he used fire and now I get it. Guys that wasnt fire, if anything those where energy blasts the kyuubi was chucking out. Smh
I never really thought about a flame rasengan, but I'm guessing if they did do it then naruto would have had sasuke help make it if they teamed up again rather than the 9 tails make it.