Yeah right, you watched Ajax before this season? Come on, please play some more excuses. Last season he was very consistent aswell. So that atleast 2 seasons.
Should he have made his debut at 12 y/o?
Being consistent in the Dutch league doesn't make you a very good player. This is his first real season where he's actually done something against the bigger and better clubs. And yet again, he didn't even play over 40 games last year.
He has big potential, but that's all it is. Him going to an awfully ran club like PSG will regress him as a player. It's happened time and time again.