how come the sage have the bijuus chakra before he defeated Juubi, cuz Juubi is the one devided into the tailed beasts...
additionally, Juubi shouldn't know about the tailed beasts and their chakra type, since they were created by dissolution of Juubi and his chakra by the sage...
in my opinion, the sage did leave part of his essence in the tailed beasts, and when all of them will be combined in Naruto, sage would come with talk-no-jutsu, just like Minato did, and also, he'll unlock the rinnegan in Naruto, or Naruto will gain it from Obito some way...
anyways, I really don't understand, how come one tails chakra is with Naruto, even if proxy, but how would any other bijuu know before hand that they will have to give one-tails' chakra to someone...and they collect it before hand..
anyways, I'm really waiting for Minato to come and let Naruto have other half of kurama...then Naruto will be much closer to achieving the state of the sage.