You're contradicting yourself here. You've quoted
Roygbiv post about the structure at Sunderland. I don't know for a fact but I'd hazard a guess that the DOF was the 1st through the door and then set about getting the right people for all the other roles.
Not one person is suggesting we just employ a DOF and no one else but if the DOF isn't the 1st through the door to then facilitate the uplift in staff and roles then who does?
Whether you agree or not the DOF role, or whatever version of the same role, oversees the entire football function bar coaching the 1st team so it makes sense for him to get the people he thinks best in the various roles behind the scenes.