It's no secret that Real Madrid is very interested in signing Mbappe, so if the contract really will be realized, I think Mbappe will be the first choice along with Benzema. With Mbappe's current form and the high salary he receives, it would be strange if Real Madrid chose to leave Mbappe on the bench. Even the most likely formation is to play Mbappe, Benzema, and Vinicius simultaneously (I think this trio will be a scary threat for Real Madrid's opponents).
but in this case it might be a little different.
when the players can't show their best then the choice is the bench and in this club there are already a lot of star-labeled players who only end up on the bench.
I think a pretty concrete example now might be Hazard and Bale.
they are good enough but when they can't get maximum results then the trust goes away by itself. things like this can still apply to Mbappe because when he is at a new club his performance decreases, we also can't predict things like this