Multiple things

It took Achilles a few minutes to destroy the squad of supposedly allied mechas, surprise was always a key point in a victory, plus it was always easier to attack someone who used the same technology as you, even better if he was a little inferior; you knew his flaws. , you knew how to exploit their weaknesses.

The combat was not resolved faster because those pilots used their same techniques and tactics, but they were mere imperfect copies; they repeated the patterns and techniques, they executed them perfectly, but they were creative, they did not adapt, and they even had a slight delay in execution. He could not be caught with his own weapons; destruction was only a matter of time.