Board Thread:Naruto Discussions/@comment-5054236-20150717003436/@comment-6769189-20150717194030

His power was spit between 2 genetic lines. Obtaining his chakra would advance the trait of that bloodline. Thats why Madara didnt have Sage Mode when he obtained the Rinnegan and why he didn't have 6 Paths Sage mode when Hashis cells activated Sage mode.

Maybe if Hagoromo gave him Yin Chakra he might have it.

Hagoromo doesn't have to give him "Ashura chakra." Indra received his Yin chakra but not 6 Paths chakra and Ashura got Yang without 6 Paths Chakra. That is why they fought.

They don't need Ashura/Indra chakra because they got 6 Paths chakra straight from Hagoromo. When Hagoromo divided his power he gave them 6 Paths chakra as well. Sasuke got 6Paths Yin, unlocking the Rinnegan Naruto got 6Paths Yang, unlocking 6PS Mode