Over the last few years, no team has been able to maintain the consistency of performance that has made PSG always dominate Ligue 1. Brest's performance was very surprising at the start of this season, they managed to reach the top of the standings after performing well since the start of the season. Nice also followed in the footsteps of Brest which made PSG have to settle for being in third place.
The chase for points will continue, PSG, which has always dominated the top of the standings, is slowly starting to find its best form. I'm not sure Brest and Nice will be able to maintain their performance until the end of the competition, there will be changes in position in the standings in the next few matches. PSG, which is starting to find confidence, will try to reclaim first position from Brest. It is not difficult for PSG to reach the top of the standings because the two are only two points apart.
It's still early in the season and usually teams like Brest or Nice will lose dominance after the first half break ends. Nice and Brest's performances were a little more convincing at the start of the season, but there is no guarantee that they will be able to maintain consistency until the middle of the season. Nice may have a slightly greater chance of competing in the top five of the standings and it also depends on how they are able to maintain their best performance in Ligue 1 because there are still other teams who will also continue to chase points in the next match
This is different from PSG, which has above average quality players and finds it difficult to pursue their dominance in Ligue 1, especially as they have unlimited money to buy the players they need. Currently PSG are starting to find their best playing form after experiencing a change of coach and I am still quite confident they will dominate Ligue 1 until the end of the season.
I think it's still very early to ascertain the how long clubs like Brest and Nice will continue to remain at the top of the league table. There's every possiblity that either of them might become a strong contender for the French Ligue 1 title this season.
Paris Saint Germaine of a truth possess a squad that's just too good in terms of quality when compared to the rest of the clubs in the league but that doesn't mean that they're automatic candidates to retain the league. They will have to consistently win their matches to take up the first position in the league table.