Board Thread:Naruto Discussions/@comment-29393962-20161111215453/@comment-6769189-20170116094922

Thekillman wrote: Madara had very little of Hashirama's flesh which is why it took so long for it to awaken. Proof?

Thekillman wrote: Orochimaru tried a whole bunch and it didn't work Gotta admit I don't keep track of Orochimaru. Chapter??

Ashura debunks that theory because he didn't have the Rinnegan despite having been chosen to continue ninshu and receiving Hagoromo's power.

So there is a possibility that the Rinnegan is akin to a recessive trait, only brought about through the Sharingan+6 Paths/Hagoromo/Ashura chakra.