If CASA were unable to provide a qualified SME to act as candidate occupying a control seat and assuming PIC responsibilities for the conduct of the assessment, why would you not engage the services of a suitably qualified industry Flight Examiner to occupy the candidate control seat and act as pseudo candidate under test? CASA Inspectorate then safely occupies an observers seat.
FOI
I am led to believe (but I am in no way certain) that there was training booked for the Chief Pilot with an industry expert flight examiner to get some C&T principles covered off. This was cancelled when the assessing FOI offered to manage the assessment as it was flown to save Rossair some time and money. I know SG was a CASA SME on type but I also have a feeling he was himself an ex Rossair pilot (not sure if this is correct however).