this below is from your link:
Although he insists that all agencies have the opportunity to weigh in on decisions, making differing perspectives available to the Oval Office, Brennan wields enormous power in shaping decisions on kill lists and the allocation of armed drones, the wars signature weapon. When operations are proposed in Yemen, Somalia or elsewhere, it is Brennan alone who takes the recommendations to Obama for a final sign-off.
But the bottomline is that Obama is the one making the decision, not his underlings.