I beg to differ on this statement sir.
PA is highly decentralized and modular. It is like a state with state.
IA has vertical division (hierarchy) in terms of rank and command structure.
PA has vertical division (hierarchy) and more important horizontal division (based on religious belief, money, geography, political belief, tribes, personal beliefs, etc.)
A solder deployed in PoK might support terrorism for any number of reason even if he has been ordered to stop terrorist activity.
It has been evident from a long time that none of these terrorist organization are under control of ISI or PA.
Even ISI is not under control of PA GHQ, Directorate S itself is not under control of ISI-DG, members of Directorate S are not in control of their boss and assets of Directorate S are not in control of their handlers.
The entire situation is gigantic mess.