Remember when Hashirama gave Sasuke his Ashura chakra to stop Madara?
Well it didn't take full effect near death. Like Madara.
When he was stabbed and came back to life the Indra and Ashura chakra must have formed Hagoromo's chakra which caused Sasuke to awaken Rinnegan in his right eye.
Hashirama probably knew this and Sasuke really did stop the majority of Madara's jutsu. Such as the black rods and Infinite Tsukuyomi
Well it didn't take full effect near death. Like Madara.
When he was stabbed and came back to life the Indra and Ashura chakra must have formed Hagoromo's chakra which caused Sasuke to awaken Rinnegan in his right eye.
Hashirama probably knew this and Sasuke really did stop the majority of Madara's jutsu. Such as the black rods and Infinite Tsukuyomi