Just to add to my post above (and I know it goes against the grain) but if I were a DoF I would be looking to keep and maintain the club‘s own back room staff, so that the manager (or head coach) comes in and works with them. It means sackings would cheaper in the even that they are required, and it also firmly underpins what a DoF should do which is coaching at all levels are the same and the club maintains a playing style and identity through all the age groups. Whether a structure like that would be good enough to entice the top managers is another thing.