The idea of the Eight Great War Gods is good, but unfortunately the forces of Emperor Mountain are not the kind to fall into chaos without a leader. Even after Ling Tianyu fell, order was maintained, and even when the Three Emperors and Six Gods went missing, there was still rigorous training in place.
The idea is great, but unfortunately very difficult to achieve. Moreover, Ling Tianyu was already prepared, he wouldn't overlook this point, and naturally understands its consequences, thus he'd naturally take certain measures.
Since it's said that the commanding figure has high expertise in military tactics, he shouldn't be compared to ordinary commanders who must foresee all potential events.
The troops have already begun retreating, and the soldiers of Emperor Mountain, upon seeing the retreat, await orders. Though they shouldn't pursue a cornered enemy under normal circumstances, this is a critical time with exceptional procedures that require waiting for their master's orders.
