PSG is still with their best game they avoid defeat that's why they can't be removed from the top of the standings even though they have drawn in the last two weeks, Marseille is too far away in points with PSG but at least little by little they can approach PSG even though several other clubs are shadowing Marseille such as LOSC, AS Monaco who both have 26 points, at least Marseille can get away from the two clubs if they don't want to be removed from second place in the French League standings.
There's this pattern I have noticed with PSG which id other teams such as Marseille and LOSC can adopt maybe they will turn out strong contenders, Monaco aswell can fit in if they get this done, at the beginning of the season they make sure to win their early games and accumulate so many points that in the nearest future even if they get to lose games they still have points to fall back at without having to really bother about their poor performance within that period, so for others if they can follow in same pattern they will create a competition that every slightest loss will keep PSG at a disadvantage and give them some edge to probably getting ahead and the title race will become even tougher and Interesting.