Board Thread:Theories and Speculation/@comment-27725840-20170731214952/@comment-27725840-20170801142030

I didn't say that the arms were from Naruto & Sasuke's DNA, I said that it was most likely from the 3rd unknown Otsutsuki. We definitely know they exist, did you even watch the anime or read the manga, they changed the entire course of the shinobi world as they created it. He could have possibly met the 3rd Otsutsuki like Zetsu met and tempted Indra or Boruto could have transported them using his Jougan to the Otsutuki world/realm. We can only speculate