What I don't get with Koeman is that Pedri being outmatched against Atleti is such a fucking easy prediction. Nothing to do with his age really, it's more physical. How he moves. Casual composure, little to no aggression, docile mannerisms.
Puig is different because he has those fast twitch muscle movements. He's jerky, he has that sudden change of pace that's needed to fight for the spaces.