These are the numbers at United. To be fair, it would be fair to compare the numbers at United and outside United. For example, Anthony has improved in numbers and overall since leaving United. Can you name anyone who came to United in the post-Ferguson era and has improved? There were probably some, but basically United is a graveyard of talent, I think that Garnacho really should leave and maybe he will progress in another club, he has potential.
Even if I will agree with you that Manchester United can be regarded as graveyard of players, it is so cool to understand that there are some strong and exceptional players who can still fit into the current situation of Manchester United. Player like Bruno Fernandes has been flourishing despite the continued poor performance of Manchester United.
This could also mean that Manchester United doesn't need upcoming players like Garnacho. They need proven players like;
Osimhen,
Salah,
Vini Junior,
Mbappé,
Lewandowski,
These players cannot flop in any club.
Yes, Fernandes is that exception and now I'm thinking about how he could have shown himself in a big club. It's sad.
From the list you mentioned, only Osimhen might end up at United due to lack of choice, but the rest? In what universe should they trade their already great positions for a place at United? It must be something on the level of Saudi wages.