Board Thread:Wiki Discussions/@comment-3238846-20140422105553/@comment-1512913-20140427200727

That's not what I meant. Roshi knew how to use Earth and Fire and being Son Goku's jinchuuriki, had the power to merge the two for Lava. Now, Naruto being Son Goku's pseudo-jinchuuriki (yes) may or may not have the power for advanced nature, but the thing is, his usage wasn't actually his, since Son Goku handled him the chakra and Naruto doesn't know how to use Fire and Earth.