Just a curious inquiry here. This chapter confirmed that you specifically need Ashura's AND Indra's chakra to awaken Rikudou's chakra which awakens the Rinnegan. So Naruto or Sasuke simply need each others chakra and or DNA and either of them have the same potential to awaken it. Hashirama nor Madara have the brothers chakra anymore as both of them died and it was passed on to Naruto and Sasuke. His DNA still has immense chakra and life force, but no longer the special properties that was Ashura's chakra.
If it is only the chakra that is needed, is the Eien No Mangekyou even needed to awaken the Rinnegan, rather than just the chakra (which is obviously rooted in the DNA of the person with Indra or Ashura inhabiting them)? Last chapter got me thinking, seeing as how it is actually more simplistic to awaken the Rin'negan through such simple means and that means both Naruto and Sasuke could awaken it simply by sharing chakra/DNA.
If it is only the chakra that is needed, is the Eien No Mangekyou even needed to awaken the Rinnegan, rather than just the chakra (which is obviously rooted in the DNA of the person with Indra or Ashura inhabiting them)? Last chapter got me thinking, seeing as how it is actually more simplistic to awaken the Rin'negan through such simple means and that means both Naruto and Sasuke could awaken it simply by sharing chakra/DNA.