The team was up and running in 2018, and i'm not sure why the board didn't select a head of football operations after Mourinho was sacked. But from reading reports they put that on the back burner and were attempting to prise Pochettino away from Spurs, who like Brendan Rodgers wants to control the whole football side of the club. But as it transpired, Ole got the job and the board allowed him to have his own personal recruitment staff. The Liverpool board were doing the same thing and they almost repeated that mistake with Klopp, but they got lucky because Klopp understood the DoF/head coach model, and Klopp reportedly asked Mike Gordon to introduce him to the person heading the recruitment department. Klopp then after meeting Michael Edwards asked the Liverpool board to appoint Edwards as the Sporting director.
I'll be happy if Rangnick stays, but for me it's not a big deal if he doesn't. And the reason for that is simple, because the concept is very simple, which is to align recruitment towards the vision of the head coach. And for me if ten Hag is the head coach, then i'd personally be more interested to see the two Dutch guys (Bout and de Regt) work closely with ten Hag due to their understanding of positional play, which ten Hag will look to implement.
Rangnick might even stay on as assistant coach to ten Hag, as was reported a while back. But we don't need Rangnick to go upstairs to tell the scouting departments to align recruitment, he can do that as a consultant. I've followed the development of his RB Leipzig team when he was at the club. And the amount of material i've sifted through learning about the structural processes at Leipzig over the years is ridiculous and it made me release how such a simple concept can be so effective.
So for me we've finally got to the stage where the recruitment department will appoint the head coach when it comes down to the identification and interview process. And that for me is a big change and a step in the right direction.