Just ruminating in the bar over a pint reminded me of one of the complications associated with SCs. Some PTs relied on industry for integration of engine/airframe/seat but others didn't. I'm not sure whether ADRP gave any thought to how this might complicate matters. It could certainly complicate how external parties view the question of who was responsible for what.
From memory (RAF) Hawk dealt with the airframe, engine and seat DAs separately and was responsible for overall integration itself. Not sure about the RN or others. This may go some way to indicating why MBA is under the microscope in this case. Probably best not go further as this is potentially sub judice.
EAP