Deploying two hundred [Hunters] to slaughter the [Vajra] Mecha company head-on, Fatty's purpose is simple: to let future collaborators know what kind of combat power this team possesses. To fight against it, you'll pay a hefty price; to ally with it, you'll gain significant benefits.
Kruze was very clever, immediately assessing the situation and making a decisive choice: to ally!
The 91th Division really doesn't have the confidence to face such a daunting opponent!
As for the verbal concession of material selection rights, to Kruze, it was really just a token gesture. Given the scale of the Leray people's two regiments, even if the 91th Division took nothing, they couldn't carry away that much stuff, not even a fifth!
Since four-fifths of it belongs to the 91th Division anyway, doing a favor smoothly poses no real loss.