Board Thread:Consensus Track/@comment-30913149-20170625232913/@comment-734582-20170626083112

Elliefun15 wrote: This could also mean that they're related via the original two Otsutsuki brothers, right? A thousand years of history is enough time to get some good mixing going on. It's extremely unlikely that a lot of pureblooded people still exist, and many people could be direct descendants.

The Senju however appear to be the most pureblooded Ashura descendants and the Uchiha the most pureblooded Indra descendants, which is why they're eligible for transmigration. But Hagoromo said that Ashura "chose" him, so in theory anyone could be a transmigrant.