Didn't you see when Barcelona played against Madrid without Lewandowski? Are Barcelona players dependent on Lewa? I don't think so, even without Lewandowski in the squad it won't affect the performance. Hansi Flick understands the club's needs very well and regeneration has been going on for a long time. So despite the financial problems, Barcelona still has loyal and quality players that no other team in Europe has this season.
I don't think so but each and every player play a vital role in the success of the team. Lewandowski has played a big role as their striker and that's why he has the highest number of goals in their domestic league, the rest of the player didn't have that numbers and not because they didn't try but because they weren't plaxe in that position of Lewandowski, everyone has their favorite individual positions they can play perfectly and Yamal is good at his wing.
If you put Lewandowski in wing, Barcelona might also do well but it wound be as better as the way they are doing now and if there is missing teams, the team wouldn't be able to deliver as before because the way they are used to each other, the rhythm changes as the players changes and such is going to affect the team performance, that's more reason why they need to keep these players, it took them a while before they arrive here.