Marseille will face PSG in mid-October. This is PSG's home match. If Marseille manages to beat PSG in this match then I would say Marseille is a worthy contender for this season's title. If PSG wins against Marseille then we will see PSG dominate this season as in previous seasons. And PSG will win the title at the end of the season. Personally, I think Marseille will lose their consistency very quickly and start going down the points table.
It's just paper calculating because football is not like math where we can count it as the dominant champion. because the session just started, if happens like your count, the PSG domination will not be like expectation because we don't know next, maybe the player got injured or something happens in the middle session that makes the situation change.
I think there is one more scenario where not only PSG will beat Marseille, but they will keep on winning until that day, whereas Marseille will lose a few games. That could result with something like 5 or more point difference until the game and closer to 10 point gap after the game.
I am not saying that it will happen that way but people do not give enough credit to PSG these days because of the points Marseille has, look at the goal difference and you will realize why PSG is a much better team, and I mean like MUCH better team, even when the points are similar. PSG will not only beat Marseille, but they will guarantee their championship after that game if you ask me.