Board Thread:Theories & Speculation/@comment-1512913-20141028151348/@comment-3279282-20141031233938

Yes, it only says "Jinchuriki", "Senjutsu" and "Kuchiyose" below his nature stats. But he never had a Kekkei Genkai, because he never had the cells he'd need to have one. Having a Biju inside him that has a Kekkei Genkai is not the same as he himself having it, okay? He can always borrow the lava chakra, but he won't ever create it on his own, because he lacks the cells for that.