Kvara and Rodrygo stats are shit consider PSG and RM.
Ralph Leao and NW's stats quite bit more solid considering ACM and Bilbao.
Football doesn't really work like that. Often players at lesser teams have good stats because everything goes through them. See Bruno Fernandes at Man United - some say 'wow imagine his stats playing for Man City or Liverpool', but at those teams he wouldn't have everything going through them and would be just another player, and his stats would probably decline.
The list of players who do well at lesser teams then cannot step up to an elite team is huge.
I don't ever buy the idea that people's stats will automatically jump up in a better team. We have seen it not be the case many times - they're surrounded by better players, who share the G/A around, instead of them being the main man at a smaller club.
Hence, people thinking Nico's stats or general game will automatically improve because he's going to Barcelona could be in for a rude surprise, in my opinion. That might happen, but it is far from a guarantee. And the same is true of any player going to a big club from a lesser team.