Henderson struggled at age 22 when he moved to Liverpool but improved every seasons after that and was a key player in 2013-2014. And the argument is that players rarely improve drastically in thier late 20s, especially when they weren't in an ascending curve way before that. The closest example I have of it would be Matuidi and it's an exception not the rule.
He was not a key player 2013-14, it was 2015 when he started to show his worth. Regardless no one absolutely one could foresee him he leading the charge for Liverpools title wins and cl's wins.
I never even said Mctominay would ''drastically improve'' I said he could be mentored into becoming a better player with Casimero's guidance. And mctominay has already shown improvements to his game in the last 3 games we have won under a coach who specialists in developing players.
He has never been properly coached under a manager who develops players. He broke through under Mourinho who used him to prove a pointto the board that they made mistake not backing him to sign a defender by putting him in defence when Mourinho reached the end of his tether and was begging to get himself the sack to bag the compensation.
Ole was never qualified to coach and develop any players in his kick and rush counterattacking football. He used Mctmoney solely to rely on his physicality and nothing more. So I don't think it's fair to write off Mctiminay improving beyond 25 when he's never played in a defined system and never been coached properly.
There are many players who were average at his age and started to ''drastically'' improve past 25. Namely Klose, Toni, Vardy, Drogba, Victor Moses , Tadic, Haller, and Mo Salah.
I don't even rate mctominay that highly myself, but this idea that he can't improve his game is frankly nonsense