Board Thread:Naruto Discussions/@comment-24826628-20141021205610/@comment-4685024-20141101171841

Elveonora wrote: Well, Ashura's chakra went into an Uzumaki (a half-Uzumaki at that) rather than a Senju this time around. NeedleJizo wrote: From what we've seen, it doesn't look like there's any Senju left besides Tsunade. So maybe Asura's chakra really had no choice.

The Senju and Uzumaki clans are distant blood relatives, so it makes complete sense that Asura's Chakra could go to an Uzumaki, since that would make them descendants of Asura as well.