Board Thread:Naruto Discussions/@comment-3568954-20140919015834/@comment-1512913-20140919111144

The Tailed Beasts aren't 100% of the Ten-Tails' chakra. In its "gedo mazo" form it still has chakra, as seen when Madara attached himself to it in order to keep himself alive with its chakra and when Kaguya was sealed, part of her chakra manifested as rabbit remained inside.