Yes, Chelsea team has used their advantage against Southampton and has been able to attack enough and achieve victory. They were very aggressive at the same time, which has inspired their fans by taking advantage of Southampton's weakness. After winning against Southampton, Chelsea has changed their position by collecting 3 points and they are currently in fourth position in the points table. However, since Manchester City has been able to capture the position, of course this season I think there will be a lot of competition between Manchester City and Chelsea, just to qualify for the UCL next season.
Chelsea played very well against Southampton and won game. They were very aggressive and showed Southampton weaknesses, which made their fans very happy. Win helped Chelsea move up to fourth place in standings and get important points. But Manchester City is also trying to finish in top four so competition will get even tougher. It is likely that Chelsea and Manchester City will fight very hard to get spot in the Champions League next season. So let's see who will win in this race.
The victory over southampton has now opened their chances of returning to the top 4 zone and will certainly make the competition in the UCL zone very tight, because there are several teams that will try to get UCL zone tickets besides Liverpool and Arsenal, the victory in the match has brought them currently coup position 4 from Manchester City and of course the position change will still occur if later Manchester City wins in another match, With the current point difference, of course we cannot say the competition will occur just between Chelsea and Manchester City, because so far even Aston Villa which in 10th position, is also still possible to end the season in the top 4 zone later especially with a long league journey.