Board Thread:Naruto Discussions/@comment-26367861-20161025235033/@comment-3965545-20161026220906

Madara chakra and Sasuke chakra may not have the same signature, or anything but they carry the essense of Indra hence their chakras being able to mix with Hashi, Naruto chakra which carries the essence of Ashura's chakra. Ashura and Indra each possess half of the essense of Hagoromo's chakra. SO TTJ Madara had that in him... Obito would have awakened the Rinnegan if he didn't die.. but it would have taken some time.