You are assuming that Rikudou was Omniscient... for all we know Naruto is the reincarnation of Rikudou BUT that does not mean that Rikudou knew this was going to happen or even if that isn't the case... why would Kishi decide to bring him back?? I mean the guy was a GOD basically... he would make even Hashi look like a retarded 6 year old.
I see, well either way Minato learned all of his Sealing Techs from an Uzumaki Lol
Well actually this makes more sense as minato is shown to be better than kushina in sealing techs and i always found it funny that kushina taught minato sealing techs yet minato is far far better than her.
Yes I agree I think this will happen when Minato gives Naruto the other half of Kuramas chakra that he sealed away. It would make sense for the Sage of six paths to appear to the person who was able to befriend and use the Kyuubis chakra. It'd be silly if Shikaku came up with a way to defeat the Juubi, better to hear it from the horses mouth.