Board Thread:Naruto Discussions/@comment-5054236-20150717003436/@comment-26675690-20150717210645

This chakra thing is a two way street. Asura and Indra's chakra contain Hago's Yang/Yin chakra respectively, and their two chakras being mixed gives Rinnegan (Hago's dojutsu). If not his two chakras being the cause of the Rinnegan then what is? Their mother's? Oh wait she didn't have chakra, so what will your answer be?

At the end of the day Asura and Indra's chakra IS Hago's, there's no two ways about it.