Just from this battle, William's team, and especially the vice leaders, learnt a proper lesson about how to keep their mouths shut, not saying anything without returning to William first and getting his blessings.
The entire team felt bad about not sharing anything with Panther and others. After all they'd have not survived all this time partially thanks to their help and contribution.
The old and strong spirit masters got already pressured to such an extent, so it was expected for William's team to run short on their oil starting from day two of this war.
Even when they were dealing with weak enemies, just the sheer number of them made them already tired. That was what Ibra and others feared to face. And thanks to the mercy shown by the heavens upon them, they got Panther and his group to guard them while they were recovering. They even offered them recovery and healing potions from time to time, helping them more in surviving till now.