Still convinced there's something there, not all players hit the ground running but you can still see some raw qualities they possess and that's the case here I feel. He looks very composed on the ball and is quick to spot a pass, that's a valuable player to have in the engine room of your midfield. Just needs time to adjust and find his feet, right now he's struggling to form an understanding with his teammates around him because things like that take time to develop unless you've been at the club a while. I would start Davies going forward and play Klaassen predominantly in the cups and Europe rather than vice versa, it will be easier for him to bed in that way plus Tom looks more than ready to be playing top level every week.
It's not fair at all to write him off yet.