That’s worth considering. Kakashi made that observation with Kabuto back when Sasuke was hospitalized and he trained while he was training Sasuke, with the one-armed First Gate scene, then again in the timeskip. playing devil’s advocate for a moment, Kakashi in War arc was spamming that motherfucker Kamui a lot—compared to the Pein arc where it exhausted him to near death after what… one or two uses near the end?