Marseille's victory was so important against Troyes with a score of 3-1 because they again took second place in the standings from Lens this week. Maybe Marseille needs to improve their consistency so Lens can't catch their points. On the other hand, Lens' previous defeat against PSG made them unable to maintain their position and had to be willing to be pushed back by Marseille. For Troyes they have to stay in the relegation zone after this defeat and it is very difficult to get out of the zone because they need at least 3 consecutive wins, but that is also an impossible result for Troyes.
A comfortable match that Marseille managed to take advantage of with a win that allowed them to shift their position from Lens to second place. But even though they managed to shift the Lens doesn't mean they can sit comfortably. They are only 1 point apart in the table and it will be a very easy gap to roll back. It will be interesting to watch the competition for second place in the current standings.
I think Lens already knew that this would be a game they would lose, that's not really a shocking result. However, to get back to that second place is definitely a hard thing to do, they didn't calculated that they would win against PSG, nobody really "expects" that, if it happens (which it does sometimes) then it is great but you do not put that in there, you just assume that you would lose.
So Lens must be thinking about some other games, both for them and for their competition as well, and think maybe they could get it somehow. I personally hope that it would be a close one, everyone should be fighting hard for every spot so that it would be good to watch, I do have a lot more fun that way because it really does provide a great entertainment.
Lens must be able to improve their performance if they want to return to second place after they lost this week and made Marseille succeed in coupling its position. The distance between positions 2, 3 and 4 is very close, so it is very prone for them to be shifted in just one week. Each coach must realize this so that they can maintain their position in the standings. Now their target must be to get maximum results in every game, because if not they will lose their position.