6path said indra, asura & kyubi chakra mixed so that he could come out.
So it seems kyuubis chakra is more related to rikudo's chakra than just a fragmented portion of juubi's.
And there was another proof, like when naruto defeated kyuubi inside his mind and extracted kyuubis chakra since then...
Naru-saku definately not coz if dat was to happen hinata would have died instead of neji protecting naruto. Sasu-saku may happen bt still one of them should be dead defeating kaguya.