As for the advantage in the score of PSG, I believe that it actually does not exist. My reasoning is that if Real are stronger than PSG and are going to knock them out of the tournament, then they should win at least 1-0. If by "accident" they are one goal behind strategically it doesn't change anything
But there are some reasons that are quite logical there because Benzema's first leg is still not in a good way because at that time he even had doubts about playing due to the Hamstring Injury he received and Benzema's fielding became a gamble for Anceloti, But maybe now it will be a little different Benzema and the other players should not be so bad now because they are currently in good form again after some time ago the crisis of victory in the domestic league.