Board Thread:Theories and Speculation/@comment-6769189-20150307180344/@comment-4271790-20150307192213

You're not the first person that's thought Blaze = Fire + Yin. Even Seelentau did at one point. So did many others, including myself. However, Blaze Release is just an augmented Fire Release, no other natures, since it was called "Fire" by both the manga and the databook.