How could you possibly state that with such confidence? My bet is that you've never watched him, but seen a few highlights videos on YouTube.
Tchouameni is 3 years older and hasn't exactly been exceptional, has he? He's been good, but nothing extraordinary.
Enzo Fernandez has been great, but is also two years older and cost twice as much as Højlund will cost.
Bellingham, while he has been great in Bundesliga, hasn't even played a game for Real Madrid and we'll just have to see if he'll live up to his hype.