Maybe Real didn't need a change in the game, and Mbappe just can't find "his place" on the field yet. The midfield has changed the most, Kroos has retired, Camavinga is injured and Billingham also missed this match due to injury. And the combination of Vinicius and Mbappe is obviously not enough to become the most formidable attack in La Liga, I don't even remember the last time Ancelotti replaced Vinicius at the end of a match when Real needed to score, to be honest, I expected him to replace Mbappe.
I just feel Ancelloti is willing to give Mbappe a chance as recently he was heard standing up for the Frenchman, saying the guy will be explosive once he finds his footing at the club but I don't think fans have that much time to spare because his signing came with so much hype that many expected he'd start doing wonders.
For now, small teams are being given the hope that they can beat Madrid because of their lack of coordination which is actually not funny considering how well they performed last season.. maybe this is just a dummy to other clubs and they will pick up and do well. If this is the case, they had better hurry else they may not be able to meet up.