Even in Part 2 he waswhy would it be a huge factor when the battle is not even about outlasting?? It takes one raikiri to the chest to end it. Not saying thats whats gonna happen but Kakashi has plenty of deadly attacks which he can mix in with shadow clones.
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. What with the passive Sharingan chakra cost and the fact that he's going to have to utilize multiple high end techniques, he's going to be drained before Neji.