This is so that non-Aircrew (are we allowed to say blunties these days?) can be Station Commanders at flying stations. So, as they can’t be in charge of flying and be its Duty Holder (DH), then you have to generate a further Gp Capt as the DDH. An Aircrew Stn Cdr can be CO and DDH, but a non-Aircrew officer can only be CO and so you have to have another Gp Capt, that is Aircrew, to be held responsible for the flying.
The replacement of the Stn Cdr by a non-Aircrew officer has already been announced:
https://www.raf.mod.uk/our-organisat...-appointments/
Group Captain M D Lorriman-Hughes OBE to be Officer Commanding Royal Air Force Waddington in January 2022 in succession to Group Captain S P Kilvington
Simple explanation, but by crikey have we made things difficult for ourselves...
