Said it before but pretty certain there's a biomechanical issue there.
Explains why running looks such a chore to him. Dragging his feet, lackluster off the ball work, generally slow on the uptake.
Explains the lapses of composure and rigidity in certain situations, as we saw today.
Explains why he looks gassed so quickly, often shortly after coming on.
And it explains why after three years with the first team (minus the one lost to injury) he has so few 90 minute appearances under his belt. ChatGPT and Claude says he has a total of 3 full games, out of 45 appearances.
Even if you're seeing something different from me on the pitch, this final point should raise some concern. Not like Flick is averse to giving full minutes to youngsters if they have the level. For reference, Espart has played 90 minutes for 4 out of 5 games.