It would be a grave mistake not to target the PAS guys in their early/mid forties as well. They are just as likely to PVR as the CS Sqn Ldrs, taking their professional aviator experience with them.
If they (the PAS) go, we lose a large chunk of the deputy Flt Cdrs, FI's, QFI's, QWI's etc - in other words many of the people on the Sqns that enable the task to get done because their time is not devoted to being promoted.