How is United setup at the upper level?
Is there a split between administration and operations level?
Perhaps a setup along these lines would best suit the club but the Glazers run things that benefit them first and foremost.
Ownership -> 1a) Administration, 1b) Football -- each has a Director; Woodward for Admin side, and whomever for Football.
Football -> 1a) Operations, 1b) Player Personnel, 1c) Scouting, 1d) Youth
Operations - oversees coaching, medical, travel, analytics & philosophy, etc.
Player Personnel - tasked with contracts, recruitment, transfers, loans, etc.
Scouting - obvious to include matchday scouting
Youth - obvious
Correct me if I'm wrong above/missing key areas but it's how I would see a proper setup to split admin and ops.
Hire a DoF, then appoint a new manager, then decide on a philosophy and build from there.
Perhaps Berta as DoF as some have mentioned, then (ideally IMO) hire Mitchell as DoPP and also tag him as the assistant/deputy DoF.