I’ll try again because maybe I haven’t been as clear as I should be.
When you say something is ‘ultimately a football department decision’ you’re right but the wording is wrong. It’s actaully ‘ultimately a board decision’.
The job of the footy department is to mount a compelling case for that decision. They prepare and present their information to the board to support their reasoning and provide a recommendation. They may even be present at the board meeting to present their case.
Then it’s the job of the board to make sure they have all the relevant information to make that decision, ask the right questions etc. Because, at the end of the day, the board are ultimately responsible, for everything.