Koeman says "It is all about the player himself. It is the same question for other young players."
is there not an element of it being about the manager and coaching staff too?
Always seems to put everything on the player and nothing on the setup he is in. Now it might just be lost in translation and of course the player is the one responsible for his own destiny but both player and team go hand in hand so it stands to reason that the environment must be right for players to thrive.