@LiveryMan
If the Co-Pilot was female, there must have been a third person in the cockpit.
While going through a number of video's one shows interviews apparently just before and during the flight. The 4-striper male captain/owner had been identified before. The 3-striper female FO (in the left seat during that interview - plane still on the ground). And a 2-striper male interviewed standing in the passenger cabin.
In another video or post there was a remark about a 'technical guy' (I think they later referred to him as one of the 6 survivors). The right role name probably lost in translation. Don't know if they meant flight engineer or a maintenance engineer taking the same flight.
POB/Passenger lists have already been published. Perhaps someone has checked those on the number of crew members and their roles.
A company with apparently only 1 plane flying taking a company maintenance engineer with it would not be a big surprise.