Board Thread:Naruto Discussions/@comment-5413572-20140703171400/@comment-24067511-20140704230130

The tailed beasts need to be combined to make Ten Tails Chakra, for one. Just because he has all nine in him, they aren't combined together. They are still their own separate entities. And he also needs the Demonic Statue of the Outer Path, which is the Ten Tail's body. And the Ten Tail's chakra isn't necessary for the Rinnegan to be awakened. Sasuke doesn't have any of the Shinju's chakra in him but he still awakened the Rinnegan in one eye. I was just as confused as you before, trust me.