To me chakra roughly translates as stamina too... Maybe Kakashi excerised.Kakashi's amount of Chakra is pretty low. But he did somehow manage to increase it during the timeskip. I wonder how he did it.
He had plenty of free time- Naruto went with Jiraya, Sasuke with Oro, Sakura went to Tsunade. And kakashi had no new student since then...
Among others Shikamaru seems to have the lowest chakra and he never was one to over exert himself.
Maybe Naruto has little more chakra of his own too (Independent of Kyuubi) for he worked hardest physically , since childhood.
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