After Ji Xinghe had shattered three Duke Mechas, the battle between the mechas of the Federation's Western War Zone and the Empire's three major army groups achieved an absolute advantage.
So much so that Cadelin, Qin Tong, Harris, Xiazi, and Quezi didn't need to bother with the ongoing mecha battles anymore, they just needed to follow Ji Xinghe in pursuit of the Empire's Great Aristocratic Mech Corps.
The retreat of the Great Aristocratic Mech Corps allowed the Independent Group's mechas' superiority to shine. The Conventional Level Empire Mecha Army simply couldn't stop the Independent Group's onslaught. Once their formation was scattered, the Western War Zone's Mecha Army could suppress them.
Whenever the Empire's conventional mechas mounted a resistance, the Independent Group would charge at them again.