Right Ben,
As an interesting side note to futher support the multiple demon problem; one of the phases of diabolical possession is what the Vatican calls “infestation.”
Webster’s defines infest or infestation as:
“1. to overrun in large numbers, usually so as to be harmful 2. to be parasitic in or on.”
Why demons choose to usually possess in large numbers is unknown.
Perhaps Pazuzu is the head or mouthpiece of this legion of demons.