Bro.. the problem is not that.. They select COAS, bureaucrats, and judges of the same traits. An ongoing officer perhaps gives away the list of his aides to NS etc. So, he elects the same breed.
You have to consider why Aamir Riaz wasn't selected despite his credentials and popularity. That low-life bajwa was selected on what basis? He must have a tainted history that suited NS.
So, the corrupt NS is a hiring manager for corrupt army officers, judges, and bureaucrats for the US, or he will lose money/assets.