Not making this post pretty cuz I gotta go somewhere fast, but here is what Kakashi says.
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Against Itachi Sasuke says Kirin will be his last jutsu. Itachi claims he's out. After using Kirin, Sasuke couldn't even maintain Sharingan which has very low chakra drain for pure uchihas, and had to resort to paper bombs to attack Itachi's susano'o.
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.
Like I said about VOTE 2. Neither had enough chakra for any jutsu at all & had to fight strictly taijutsu for hours before the kyuubi interfered.
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