Name a couple forwards that exploded AFTER their 100th first tier appearance.
First tier where? Do we count Netherlands, Poland etc?
In terms of career minutes Kean hasn't come close yet to his 100th appearance.
In terms of stats Cavani was a joke with Palermo and suddenly exploded in Napoli after 4 seasons with Palermo. He was 23/24 when he got to Napoli.
Lewandowski was awful his first year in Borussia, had well over a 100 apps between Poland and Germany first tier and exploded in his 2nd year with Dortmund. He was 23/24 at the time.
Suarez was 24 when he got to Liverpool, exploded really in his 3rd season both at Ajax and at Liverpool.
And this is only some of the best strikers of the last 20 years. Not saying Kean will ever be on that level but in terms of time for development, physical and mental maturity, he has years ahead of him.
Mbappe and Haaland are really warping people's expectations. Most players in general, not just strikers, don't reach their full development until 25-26 years old.