He is in a different space mentality right now.
Koeman played him as striker against PSG and he played well, but couldn't finish a ramen with a fork.
I reckon he doesn't reach this level at Barca. Too huge of a mental debt to overcome.
New environment, fresh start. Etc. like the bloke who changes for the new girlfriend but not the old one but then she is all like "but why didn't he change for me?". Well I'm sorry Trina, but maybe it's because you were a lying, conniving bitch! And that when you said you were having a girls you were actually with Carl in Acapulco. And so what if I want to where speedos instead of shorts!? Maybe they don't look as cool but they allow me to swim faster, it's in the fuckin name!?!?
...sorry lads, went off on a tangent there. Where was I?