Personally for me I don’t think Barcelona need Nico Williams, if they wanted a left winger they would have gone for Ademola Lookman who is cheaper and more efficient. But then, I think they’re bringing him in based on his relationship with some of the barça players and he already has a sync with Lamine Yamal so adapting wouldn’t be a problem.
The player wants to go to barça, Athletico Bilbao tried to hold him down last season gave him the no.10 jersey but they might not be able to hold him any longer.
Barcelona will need a scorer if Lewandowski leaves Barcelona. Nico Williams is talented. But can he play in Lewandowski's position? Also, does Nico Williams have the ability to score as many goals as Lewandowski?
Nico Williams only scored 5 goals and 5 assists last season. So I don't think Barcelona will get a good performance from Nico, as Barcelona needs a scorer. Even then, Barcelona will probably add Williams to the squad at the request of Yamal and Pedri. But I think Barcelona will need to buy an experienced scorer again in the next few seasons. However if williams' performance improves with the help of Hansi flick, the scenario will change.
Barcelona should be looking for a center forward to be plotted as Lewandowski long term successor. Nico Williams is indeed a talented player, but his arrival might threaten Raphinha position, and I don't think Hansi Flick will turn one of them into a center forward after Lewandowski leaves later. Barcelona front line productivity is actually quite good, Barcelona should not need to force themselves to recruit a winger.
So far there has been no official news regarding Nico Williams transfer, many people believe that an agreement will be reached soon, but Barcelona must first ensure that the recruitment does not have the potential to violate La Liga FFP rules. It is only natural that Athletico Bilbao are trying hard to hold back Nico Williams departure, they don't want to lose their best asset.