Draiss didn't bother to recruit the ones that were already totally loyal to the army, nor the ones that Ash felt couldn't be trusted to not turn on him the second they got done taking him up on the offer. He still did rip a couple apart for the power, which he used to tempt the ones that Ash suggested over to his side, going for the quality demons rather than the majority. Those were where the power was, the others were just fodder to show who did what and needed to die first.