You guys are forgetting that the Jubi is not in its full power form, hachibi a Kyubi are not molded in it. Also Naruto was given some chakra from all the tale beasts (apart from the 1 tail), so in a sence if Naruto is able to smmon that chakra maybe he can make a jubi of his own.
But I think there is more for us to see on Naurto and Saskue powering up, the way Kishi has played this series is that the younger generation surpasses the older, thats what the whole story around protecting the king was.