Actually, not only Mbappe to make Real Madrid's line-up balanced, other players can do it, including Joselu, as long as he can show and prove his best game. Indeed, maybe some of us will see based on their fame, but that does not guarantee that they will be able to really display the game as expected.
It could be that the player who is always placed when Benzema doesn't play is different this season, yes it is Rodrygo. Who knows, they will be able to perform better than the players who are associated with Real Madrid now.
Yes, other players can (and by the way, even more average ones can), but we all want to see epic confrontations with epic "signs" like Real with Mbappe vs City with Haaland. Was there anything epic last year? I don't think so. The title of the City was as dull as a simple trip to the store for bread (and for various reasons, other buyers either did not need bread or did not have money for it).
Yes, it is indeed because of the influence of the big name that is on a Mbappe. It is not wrong to say anything in this regard, because it is undeniable that he is a quality young player whose arrival is eagerly awaited.
Talking about City with Haaland, it's an attraction in itself, because he is one of the most successful young players now. And even more interesting, he did not choose the wrong club. By the way, now that he's scored two goals in his first Premier League game, that should open the scoring for him in future matches. Last season he was the top scorer and he can do it again this season.