This post will be deemed overly harsh and cynical, but...
The worrying thing about him is the lack of significant strenghts. He really doesn’t seem very athletic, does not have the pace or the stamina. His technique is not really top class either. It’s obviously still early days, but I’m not really convinced so far.
He’s still young, but the truth is that he is currently far from good enough if we aim to compete for top 4, and so far I’m not seeing that special strength that would make him good enough in the future.
He is supposed to be a special talent. We paid a significant fee for him, so the expectations are obviously high. Is he really better than players we already had in our ranks? Same question sadly applies to multiple Mourinho signings.