Football teams are all about balance, think Carsley’s issue was forcing Foden and Bellingham back in the same team. Looked far better with Grealish, Mainoo/Gomes.
Sometimes you need an extra player in there to do the donkey work so everyone else flourishes. Germany were losing a lot of games and then Andrich comes in and everyone ahead of them starts playing better. Italy and Milan always had Gattuso with Pirlo.
Issue with England has always been trying to fit everyone in, Lampard-Gerrard days most famously when Carrick or Hargreaves should have been playing every game for balance.
Despite being a ‘flair’ player I think Grealish at an elite level is quite underrated for a team’s balance, his ball retention ability is excellent and for winning frees. Should have been in the Euros squad, offers something different. And Gomes is exactly the sort of unselfish player you could do with, just keeps things ticking and knows his role, no ego unlike Bellingham and Foden.