Board Thread:Theories and Speculation/@comment-1872728-20151008094957/@comment-26541067-20151009171612

i also think the wood release might be a recessive trait that could be traced back to the shinju.i cant say whether or not it originated in hashirama and was not possessed by any other senju.but i agree with bob1200 that its a (albeit recessive) gene passed down via hagoromo or kaguya from the shinju itself.even though it might not be identical to 'shinju wood' it shares some characteristics as previously mentioned.one being absorbing chakra and subjugating bijuu,which is completely unrelated to regular wood and trees.i therefore believe mokuton is the manifestation of an ancestral trait dating back to the shinju,hagoromo or kaguya that has mutated over time into a watered-down state ,much like the sharingans descent from the rinnegan/juubi eye.thats just what i think.