I would argue that he has a good «foundation» to develop from. Physically and technically he looks very good. And at the age of 21 there will be time for improvement. But I see your point. Its often difficult to adapt to the passing game of a top club. That being said, this will often be the case when you buy a player from a smaller club.
And look where players like Ben Davies, Trippier, Robertson, [Irrelevant point], Mendy or Meunier played for at the same age. Kyle Walker to had a few obvious limitations to his game at that point of his carrier.