Board Thread:Theories and Speculation/@comment-32891032-20170919081809/@comment-30323490-20170919090555

It's a good theory nonetheless. It is also sustained by the fact that even Yamato is listed as a yang release user. Although he may be unaware, having Hashirama's cells may force him to use yang release subconsciously while using wood release, hence why he didn't listed yang release as one of the components for WR when he explained it to Naruto.