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I think in general 1 cars = 1 kakashi, in most chiness novel he is used as a unite value xD.
though it would be him since he use "two" sword after release xD.
if I had to explain why she didn't help, it happen too fast and she didn't get the info (if hiruzen or the other "higher" up didn't want to help she wouldn't know except after the fact). Then she didn't "avenge" tehm since if she was to do something while a war was comming, it would destroy the leaf left by hashiram. All in All, she was "alone" and couldn't act "wilfuly" or risk destroying everything she worked until now. She is also the host of the 9 tail which will restrict her action even more.
it is since there are more than one body. Even the time travel since it's no longer "him" but another self. It's similar to a morty from another paralel world F****** his women. After all, you just said it, it's just Morty...