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The foot works for either case, as mentioned before. When did Karin notice Ee stopping? Karin's assumption about their action said nothing about him stopping. How are they identical? Against Muu, Ee is quite clearly towards the side and swung up. Against Sasuke, Ee was dashing at him with his upper arm and back on a direct path towards him.
Worlds apart? No, the difference isn't that major. Even Ee's regular speed was shown to be amazing and keeping up a feat. You keep bringing up Sasuke "looking the wrong way", even though I keep pointing to to previous examples where Sasuke still "recorded" movements even without looking directly at them. We were outright shown, that why Sasuke had trouble following Lee and keeping his eyes on him, he was still able to predict and record his movements.