Board Thread:Theories and Speculation/@comment-26379028-20150523070516/@comment-732150-20150527030151

For me, the introduction of Yin Release made Blaze Release and Crystal Release make sense. One of the defining characteristics of crystals are their precise structure. That was even a plot point in the arc where it was featured. Yin Release is all about creating form. If you create form on the Earth Release chakra, which the third databook characterized as being capable of changing the composition of things, you have Crystal Release. And since Sasuke's use of Amaterasu and Kagutsuchi was only called Blaze Release when he began manipulating it, I'd say it was also Yin Release. Since non-basic "X Release" are combinations of the basic ones, the name change implies something got added to Fire Release, and Yin was the only one that made sense.