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Decent episode, I expected the 7 swordsmen to be more epic since they were talked about since even before we knew of Oro or pretty much any big villains.
Wasn't that sorta the whole point of the episode? In the flashback he was "out of chakra," but the desire to protect his comrades gave him enough extra energy to keep going.
It's like wanting your car to drive on an empty gas tank, won't work no matter how much you want to. Or at least that's what the chakra pool used to be about.
As for Kakashi, compared to most shinobi especially naruto, he has generally low chakra levels but is supposed to be able to use it very resourcefully. Maybe he wasnt really exhausted and just needed a moment's rest. Anyway this is nitpicking especially in present Naruto with regular shinobi able to keep up with immortal zombie ninjas with infinite chakra.