As long as Mbappe doesn't have the same behavior as he did at PSG then I think everything will go well and even Madrid will get better and I'm sure of that. Indeed, we know that Mbappe still has a selfish nature in him and that is a normal thing because he is a talented player and his age is still very young so it will be very difficult to control but on the other hand I am quite sure Ancelotti can suppress Mbappe's ego while in Madrid.
We know that Madrid have a lot of young and talented players but from season to season we can see the level of their ego is not big because they can always be controlled well by Ancelotti including for new players like Jude who came last season he can also adapt well in the end. This may happen to Mbappe because he must realize that this is Real Madrid not PSG when he is acting up then Perez can make him leave at any time.
To some people, they think the arrival of Kylian Mbappe to Real Madrid is probably gonna cause some rifts among the top footballers in the club. We understand that Vinicius and Jr used to be Real Madrid's best forward player before the arrival of Kylian Mbappe so some think he would not want the France international to be recognized ahead of him in the club but I seriously do not think that's gonna happen because of the kind of managing that's managing the Real Madrid squad.
Carlo Ancelotti's Ancelotti is a calm, cool and collected manager but one thing yet he instils absolute discipline on his squad which is why I think he's gonna spell things out for the team from the very beginning of next season so they work together as a team instead of fighting for individual accolades. The arrival of Kylian Mbappe will not bring any sort of confusion to the Real Madrid team rather it'll help the team to continue to dominate Europe
Of course, there will be assumptions like that, but just like you I don't agree if you say this will be a split in the Madrid camp just because Mbappe and Vini have the same position.
As I've said before, Ancelotti and Madrid have always been able to lower the egos of the players and the proof is that Jude, Tchouameni or Camavinga don't even have an excessive attitude even though they are placed in different positions and even in some statements they hate their position being moved but they respect all the decisions of the coach because it is aimed at making the club better.
Likewise for the case of Vini and Mbappe because I think they already know that personal interests are not greater than the interests of the club so they must know that they can work together more and Ancelotti knows what he has to do without having to sacrifice one of them.
I still believe that for next season the trio of Vini, Mbappe and Rodrygo will adorn Ancelotti's 4-3-3 line-up and scheme which will indirectly make the position of Vini or Mbappe to be moved to CF.