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 water+earth, hence why he didn't list yang release as one of the components for WR when he explained it to Naruto.