Board Thread:Naruto Discussions/@comment-1018594-20160409062530/@comment-734582-20160619201650

Elveonora wrote: I don't agree with Uzumaki having been descended from both Asura and Indra. Naruto, an Asura incarnate appeared in the Uzumaki Clan, but there is no mention of an Indra incarnate ever hailing from the Uzumaki Clan. Well we have a sample size of 4 transmigrants from a pool of possibly about 20.

Secondly, transmigrants chose who they transmigrate to (Hagoromo says Ashura chose naruto). Furthermore, Transmigrants seem to default to the most "pure" of their descendants (that is, Uchiha are the purest Indra descendants and Senju the purest Ashura descendants). Secondary clans like Uzumaki weren't needed until the Senju essentially died out. Hypothetically if all Uchiha had died in the massacre for whatever reason, the next Indra would not be an Uchiha.