Yesterday's home defeat against Eintracht in the Champions League showed just how weak Marseille are. Marseille have shown a good streak of results but it is clear that they will not have the strength to continue at the same level as PSG all season - unexpected results like yesterday will happen in Ligue 1. And even if, due to some miracle, Marseille can share points in face-to-face meetings with PSG, I am sure that by the middle of the season, Marseille will lag behind PSG very much.
What happened to Marseille yesterday can happen to any team regardless of their form at the moment. Marseille enjoyed more possession of ball in the game but failed to utilize their chances to score goals but I don't think their defeat is as a result of their weaknesses rather I think the luck was not on their side in the game at such they couldn't score a goal. With the performance shown so far by Marseille in Ligue1, I don't think the team is going to drop points even though they face PSG which is their biggest problem in the league right now, they can go all the way to beat PSG when they face each other If they attack very well and do well in their defense line.
If I see the last match, Marseille only focuses on Ligue 1. but it's not a problem if it's a chance to better because PSG is a great rival that needs full power and energy to concentrate. So far they create the same points and progress, the statistic has been better with 5 wins in a row, maybe because their players are pretty good on average which makes Alexi Sanches look comfortable with the strategy.