Board Thread:Theories and Speculation/@comment-3001903-20160813043039/@comment-25122992-20160820120521

Well, Yamato was literaly implanted with Hashi's DNA, so it's still the First's Wood Release, not the one of his own. Moreover, all the attemps to recreate WR were based solely on Hashi's genetic material. If there were other remarkable WR users before him, their DNA also would've been gathered and used for such experiments. At least, their WR use would've been recorded in shinobi history, while there's completely no hint on it.