Let's say that's true, Foden and Lewis are evidence to the contrary... Look at his time barca. Girona are the ones developing the kid, Pep, will take him when he feels he has hit that level.Because they can and that's what they do.
Pep isn't really known for his trust in developing kids, this Savio lad included. He's a cheque book manager, he wants the ready made stars. Wouldn't surprise me if they're secretly working on a deal for Mbappe.