It is uncertain if Takagi Sadamune is simply  Sōshū Sadamune after he returned to his home region, a son of his or someone who he taught sword making.
The identity of Takagi Sadamune remains uncertain: whether he is the same person as Sōshū Sadamune upon returning to his home area, if he is indeed a son of his own, or if he was someone he trained in swordmaking.