Barcelona has poor finances and of course it will be very difficult for them to be able to compete in the race for the La Liga title trophy at this time, so joining Barcelona is no different from staying in Bilbao athletics because there is no guarantee that he will get the championship trophy in the future, currently of course Nico Williams prestige has risen drastically so there is an opportunity for him to be able to play at another club that is better than Barcelona and also Athletic Bilbao so he has to consider it carefully for his future.
In fact when talking about money for Barcelona this has happened in recent seasons but for the problem of competition they are still able to compete with Madrid even last season they could become champions with limited money. So in this case I think money will not be a problem that is too complicated if in the end Flick can utilize the player because for competition in La Liga will definitely remain the same where there are only a few clubs that can be in it including Madrid and Barcelona and for the champion will also remain the same where the choice is only two namely Madrid and Barcelona there are no other clubs.
But even so finances are still important even though it does not interfere with the competition but the value and doubt for Barcelona in the end becomes greater than Madrid. At the moment I think everyone is aware that in the end Madrid are still dominant especially with the arrival of Mbappe and possibly some other players who will fill every line especially their defense next season which can strengthen their situation compared to Barcelona in the championship competition.