wait.....that is what i am talking about bee is saying a chakra exchange.....mine is percentage.....but on naruto look at this link.....
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when he is using the kyubi's chakra...he is suppressing it with a seal....but is was not stated there that the kyubi is using naruto's chakra....when he is in tailed beast mode...only when they want to separate the negative and positive chakra of the fox that the fox could grab naruto's chakra and control it....