There is no connection between the two.
It's all a load of nonsense. There are very few top sides in history who haven't actually brought through young players. It's just that if you can spend 40 million quid on every position, you don't need to. That's the top & bottom of it.
The idea that managers & coaches can look at these players & know for sure which ones amongst the best of them will make it, & which ones won't, is also complete bullshit. If you were to get the lesser known quotes of every manager & coach in the history of football, including Allison, Ferguson, all of them, you will find them talking complete bollocks about certain young players. Ferguson for instance told everyone how Utd were set up for the future with their young players. Wenger signed Jermaine Pennant.
I've made this point elsewhere & been told how I know nothing & that these people are professionals so I should just accept that they do, then there's 100 posts laughing at Utd for signing a 19 year old kid for 50 mil because OF COURSE they don't know if he will be good enough. OF COURSE they don't. If they say they do, they are fucking lying.
They will find out over the next couple of years if he is good enough. Same with Depay.
And Pellegrini is in exactly he same situation with our best prospects. Neither he nor Vieira know if Lopes or Denayer or Roberts or Barker etc etc will make it. They just have a best guess. The proof comes when they play in the team for a period of time.
Bringing some from the subs bench to try & learn to play i the first team, involves no risk whatsoever. Never has, never will.