That's a fair opinion and you see more of him than I do, I do however think it mostly his physical profile as well as age(21) and the fact that he clearly does have technical ability (however inconsistent that might be) that might be attracting us and as I mentioned we have been linked to a similar cm in Habib Diarra. Perhaps if this is actually coming from Ten Haag then he may feel he can mould him to what he wants as he would be second fiddle to Casemiro in the short term anyway.
Could I ask what in particular you feel he lacks at this point that makes him not good enough for a top club?
Consistency. Can be 8/10 and 2/10 in the same game. Can be 8/10 for two weeks and then 2/10 for 5 weeks. He has too many average or below average performances still and not enough consistency mentally in his game yet. I think that will come in time but needs to pick up if he wants to make it at a top club. He has the technical and physical qualities to be an elite player but he needs to improve his concentration and application of those talents.