Well yes we're talking about a more direct connection here. The Juubi is the God of the world, so one way or another everyone came from it.Plausible to a great extend. Though ancestor is a bad choice of words here, I think.
The powers originate from it, that's for sure. But so does everyone's else in some way. They are just closer connected to the sage and sons, IMO. So a better chance of control. Even the nara clan could maintain some control over the Juubi, their Ninjutsu originates from it as well...
loli agree with this even the obito part( it was obvious but it makes sense and i think obito has a good reason too but NB as a community is not too bright). The sage being uzumaki theory i read a couple of weeks ago though.