Brahim Diaz is a successful player, he can play as a starter anywhere he wants, but he preferred to fight for his place at Real Madrid.
Brahim Diaz's possible positions are right winger, left winger, and attacking midfield. He can't play anywhere like Valverde. Valverde is a truly player who can play in any position (attacking, midfield, and defense).

I also read about Darwin Nunez today, I think he is a good signing for Napoli.
I heard the issue that Liverpool is trying to swap Nunez-Chiesa with Osimhen. Liverpool may still need to pay some money as the addition fees. If Napoli management agrees, it will be a good deal for them. This is actually interesting because both Nunez and Chiesa are also quality players. Instead of loaning Osimhen to another club, accepting the offer from Liverpool looks profitable for Napoli.
News: https://www.teamtalk.com/liverpool/victor-osimhen-liverpool-napoli-swap-dealIf Barcelona cannot sign Nicole Williams, it means that Bayern Munich would use the opportunity to sign him since they also have interest in him.
Nicole Williams? I think you mean Nico Williams.

There are 4 big teams who are interested in signing Nico Williams. Bayern Munich, Arsenal, and Real Madrid are competing for signing him. Sure, Bayern Munich looks to have a bigger chance if Barcelona fails to sign him. However, it is not impossible if Nico Williams may change his mind to choose Arsenal or Real Madrid. I assume Arsenal may be a better team for him because he must be the main player there.
Of course, Barcelona financial problem can deprive them from signing Nicole Williams because it will definitely affect them. Players salaries were cut down and younger players from the academy was brought in to fill up the vacuum since the club is broke and doesn't have funds to sign senior players. I wonder how they will make this possible.
Does Barcelona still have financial problem?
No doubt Barcelona must adjust their financial to fulfill Nicole Williams salary. I'm sure most players don't to have a more cut on the salaries. So, it won't be possible to sign Nicole Williams if Barcelona is still in financial problem.