Kurama has technically lived through Juubi. Just like how Orochimaru lived on through Anko.What? They're still plotholes. I know the definition of plothole.
(1) This doesn't explain how Kurama knows jack about the Sage's techs or anything about The Juubi.
(2) What? This is a massive plothole, how did he use kamui when he didn't even have MS yet?
It is entirely possible that Zetsu saved Obito..