Has he showed in training that he's up to it.? Has he looked as good as Muniz, Watmore, Forss or Akpom? I don't know the answer to any of that. If a manager is presented with a player that he looks at and doesn't think he is ready does he just play him anyway to satisfy the club or show politeness?
I hope he proves to be good of course but he wasn't necessarily a signing that you looked at and thought "that makes sense". The key really will be what another manager makes of him. If he's not selected again then you'd worry about the investment the club have made.