What Nice and Monaco lack is consistency in play. I think it is normal that underdogs rule the league at the start of last season then their results decline as the season progresses. This can happen because the underdog team usually does not have enough squad depth to maintain consistency in play. Injuries and fatigue are what underdogs suffer from and when that time comes, they will struggle in the second half of the season.
Injuries and fatigues hits harder on the main clubs that are actively in the race for the Ligue One title. Not a fair run but most of these teams will managed to escaped the suffering long run without key players while the consistent team will continue having good scores in matches. Luis Enrique is happy to work with his players, they're dwelling on good results which have become a top priority for the club. They're first on the table and their opponents have tougher fights to win. Paris Saint-Germain have arranged the basic qualities and settings that would elevate their club.