No player is bigger than the club, Kylian Mbappe leaves and nothing will drop down the performance of the club if the coach has the player's to win him games.
Don't forget that it's football played by eleven players, Mbappe will not reduce the performance are of the club. Berkham was important for Manchester United but he left and they coped. Same thing with Cristiano Ronaldo who left Manchester United and they did well. He left Real Madrid and they've also produced mlre two Ballon d'or winners.
The absence of Kylian Mbappe is just for the main time. Luis Enrique Is a good coach and he knows how to improvise and win big games. This first season is quite challenging for him.
No player is bigger than the club but until now the fact that Mbappe is given great privilege and authority at PSG is still very high so things like this still cannot be said that there are no players who are bigger than the club because it seems that PSG is now still under Mbappe's control.
The great authority in the previous contract makes Mbappe currently in a situation that is difficult for other players to reach even though this season is not as bad as before but until now Mbappe is still highly prioritized compared to other players which makes the PSG situation seem to spoil Mbappe too much because of the previous contract.
At the moment there are actually several things that can be improved including making a new breakthrough for PSG by overhauling the existing scheme but the problem is whether they are ready for that because indirectly this means that Mbappe must leave if he does not want the same situation where the player cannot be bigger than his club.