I think he showed in the first half he could cut it. He was their stand out player, but playing 50 games in one season compared to what 15 games for the u23's is a vast difference and maybe he tired? That was the same as Joe Williams who started off well at Barnsley, but their fans were saying he looks tired and he eventually got injured, Connolly and Robinson had strong finishes but they weren't in the team for most of the first half of the season.
He wouldn't get into the Chelsea, Arsenal or Spurs sides, but he wouldn't get in ours ahead of Sigurdsson, but playing him off the bench and in cups will help him progress as a player. He's technically good enough just needs to be helped into a good enough player for us and those teams.