We have seen kylian Mbappe move from the wings to being the point man and he did well individually scoring lots of goals but the issue here is even when Mbappe was on the wing you could see he was born to score goals, Raphina is different from that, he like to make the play as much as he likes to score goals and so does Nico William, I don't think they are the natural replacement for Robert Lewandowski. Let's see how Hansi Flick will do it if Barcelona can get Nico William.
Mbappe has indeed managed to score many goals even though his position as a winger was changed to a center forward and we should appreciate that. Because usually if a football player's position that is already attached to him is suddenly changed to another position, usually there is always a fairly long adaptation period. But Mbappe denied all of this, because since he came to Real Madrid he has been able to score goals immediately even though his current position has been placed in the center forward sector. So the point is it cannot be denied that Mbappe does have very qualified talent and skills as a striker.
Then talking about Nico William who, if he is successfully brought in by Barcelona, I don't think his playing position will be changed by Hansi Flick. Because next season Barcelona still has a contract with Lewandowski, so it is certain that Nico if brought to Barcelona he will still play in the position he likes to play in Bilbao, namely as a left winger. But maybe Nico will compete a little with Raphinha, because Raphinha is also currently positioned as a left winger in Barcelona. So with that, maybe Hansi Flick will play a strategy that makes how the two players continue to play in the same match, maybe Raphinha can be played in the first half and Nico can be played in the second half, or vice versa.
In addition, Nico can also sometimes play on the right wing, so if Yamal is injured, he can replace that position. So basically there is no problem with the position if Nico joins Barcelona.