Board Thread:Theories and Speculation/@comment-26138683-20150322132758/@comment-4912646-20150322213447

Seelentau wrote: Chakra isn't a combination of Yin and Yang. There's a difference in combining the energies to create chakra and combining Yin and Yang chakra to create Yinyang Release. Only those who were "touched by Hagoromo's power" can use the latter.

Using Yin-Yang Release is definitely different from simply forming chakra (which is said to be based on Yin-Yang Release), but the databook has a caption stating "spiritual and physical energy. That is Yin and Yang." Or something to that extent. I guess we'll likely never know how it all works for sure.