Are you okay mate?
I'm being ageist by suggesting you can't judge a 20 year old in his first season in the PL in his first few months in England overall?!
Great examples for both Arsenal lads - been at the club their entire lives, used to everything, in the same system for their entire careers - of course they fit better and match their respective team better?
Ayari's been in England/Championship/PL for about 3 years mate.
Hence my point - judging a young player as "not good enough" and that managers have "seen enough" after a few months is dead weird. If it was your logic - Seamus Coleman would've been shipped back to Ireland within a fortnight. Young players have to be exceptional to be good abroad, even more so in England where the demand is just insane, hopefully this isn't news to you as it's been going on for ages. It's why every team that focuses on youth has them basically bedded in the system and environment before becoming instant starters. In fact, you've given great examples about the exact same thing above while trying to prove the opposite, so thanks!