Real Madrid didn't build their squad without faults and without deadweight, no one does that.
And even in the future their squad isn't going to be that complete, and tbh no one right now have that ultimate squad. Not Bayern, Liverpool, City or Chelsea even and for sure not RM.
From the names you mentioned, Luuk and Demir are on loans and will leave in winter or summer, Pique most likely retiring or going to MLS.
Mingueza, Coutinho, Busquets, Puig & Umtiti has their contracts ends in 2023
Would say that Dest (prefer keeping him) and Lenglet has a market and are serviceable players, so they aren't deadweight.
Alba is still good enough as back up, main problem is contract is until 2024 so probably will stay more one season than his welcome, but as back up I would take it.
Stegen is the biggest question mark, and I hope we finds a way to offload him and that there is a market for him.
Braithwaite and Pjanic are the only real troubles there, contract till 2024 and paid higher salaries for their abilities.
Overall ain't bad situation for rebuilding team.
The main problem is nailing reinforcements, having few world class additions changes the dynamics of the whole team.
They will make mediocre players appears to be solid role players, and solid players as decent starters.
We don't have those anymore.