Board Thread:Naruto Discussions/@comment-25518058-20141009110417/@comment-4516570-20141019051650

I think it's a feature of the seal and the fact that it allows their chakras to mix together in a way other seals don't. Remember, when Kurama's chakra forcibly took over Naruto, he transformed just like the other jinchuriki, so if Kurama was sealed another way, the transformation would probably be the same. (The real answer is that Naruto and Minato are the main feature, not Kurama.)

As for the other thing.. When all the tailed beasts convened before Naruto and Hagoromo, Kurama seemed to be a single consciousness, and appeared to be the good ol' standard Kurama, or at least not only-Yin-Kurama, which makes sense, yes. Why it was only Yin Kurama that appeared to Naruto in the last chapter, I guess, is because the consciousnesses of the other tailed beasts are currently unavailable, and Yin Kurama is still physically sealed within Naruto.