The third match will be much more difficult where PSG must face Lens, Luis Enrique must be able to maximize the players he has and the third match must be a comeback for PSG to get full points. Mbappe and Dembele will be even more solid after going through some training and I'm sure that now they are united because they have adapted in the previous matches.
Unfortunately, yes.
Yes, they should. however, the draw in the first two games for PSG is not good enough. PSG has indeed experienced a slight decline in performance, perhaps due to the lack of good players there. And currently their performance is still unstable. There is some work that Enrique has to fix. The first two matches were failures, even though they didn't lose, PSG class should be able to get full points in those matches. It's probably still early in the season, so at least they still have plenty of opportunities to fix it and take the top position again as long as Enrique can make his whole team work optimally and ignore the skewed issues that might exist at his club.