When opposing forces are brought together as one, all creation is born. By combining the powers of the Senju Clan and the Uchiha Clan, one could give birth to an even more supreme power.
This was the "truth" Madara had discovered long ago after reading the inscriptions on the Uchiha Clan's stone monument. Based on this premise, after fusing Senju Hashirama's cells in his later years, Madara had indeed obtained a brand-new Pupillary Power that surpassed the Mangekyou Sharingan: the Rinnegan.
This time, as an Uchiha clansman who also possessed the Mangekyou Sharingan, Uchiha Sasuke would likewise meet the conditions to awaken the Rinnegan after transplanting Hashirama's cells. To Madara, this was by no means an impossibility.
Chapter 171