Yep, the players are respect with Ancelotti, if Mbappe becomes selfish and he don't listen to Ancelotti, I believe Ancelotti will don't mind to put him on the bench and replace his position with Endrick.
Mbappe shouldn't bring the culture in PSG to Real Madrid, PSG is really scared to lost Mbappe and not really looking to win every competitions, while Real Madrid goes opposites.
Its most important thing for every players under Carlo Ancelotti tactician, I don't think Mbappe have more ego how he did with PSG and playing more dominance individual than team working.
Actually what happen with PSG in last several season some players have ego because lack controlling with manager exactly when PSG have star trio Messi, Neymar and Mbappe.
I think PSG get difference result in Champion League if manager have good controlling with the players ego sack him from regular position and never give any more minutes playing, but last season under Luis Henrique, Mbappe keep playing well and reduce his ego as usually many fans think he plays more individual than working as the one team.