there are things called outliers....... We're arguing the manga Kishi wrote, not how you think it should have gone.
Yea he his stamina improved. His speed/reactions not so much.If you didnt see an increase in his stamina/chakra then you werent paying too much attention.
Part 1 Kakashi was falling from using 3T too much.
Part 2 Kakashi faints from using MS too much.