Board Thread:Theories & Speculation/@comment-1512913-20141028151348/@comment-3531945-20141103103737

I always thought kakashi's eye replacement was yin-yang not just yang, since naruto wouldn't be able to breath life(yang) into the eye without actually forming the vessel with yin. He was having trouble explaining that though lol

This means that the seal was only for the six paths chibaku tensei, and the rikudo gave them his whole chakra (yin&yang) rather than partitioning like we thought.