I would love to say that, the young shaal grow same way it was years back with Jose Mourinho and Frank Lampard. I'd say same here now with Luis Enrique and Xavi Hernandez, but I'm afraid Luis Enrique is experienced and should have upper hand of how Barcelona and Xavi Hernandez would lineup.
Not too long, Robert Lewandoski also made metion of playing against Kylian Mbappe ND here they're together in the Champions League Competition before Kylian Mbappe finally moves to the Spanish League Competition at the start of the new season.
My Prediction is that, Paris Saint Germans would get the better of the game from both legs and would progress to the Champions League Semi Finals finally. Not really sure Enrique had issues with Xavi Hernandez, he's already played his best all over the past years. A chance for Ivan to.showcase himself was only permitted.
Barcelona continue to surprise me in the Champions League unlike their general look.

First I thought Napoli would manage to eliminate them. However after watching the performances in the first leg Napoli were a huge disappointment for their fans. After that it wasn't too difficult for Barcelona to finish the work in the rematch.
Now their job is technically more difficult. PSG are a quite serious problem when we consider especially the Mbappe factor. I feel like this could be the round Barcelona say goodbye to the Champions League so I agree with you. Xavi has at least improved Barcelona's poor look in this tournament in the recent years.