Board Thread:Naruto Discussions/@comment-5054236-20150717003436/@comment-4136079-20150717120054

Rage gtx wrote: Hagoromo sons have recieved: Indra - Sage's eyes and his spiritual power(yin chakra); Asura - Sage's body and his physical power(yang chakra)

Those parts aren't acquired separately. Sage's eyes is his spiritual energy, and phyiscal for body.