The silly mistakes in the match against Tottenham, especially for the 2 goals scored in the first 11 minutes, prove that Chelsea still have to prepare and improve to be better. In addition, it is actually not only the defense that needs attention but also teamwork and individual players which in my opinion at this time Chelsea players there are only a few who shine enough and the other players are helped by it.
As in the match against Tottenham I only saw impressive performances from Palmer and Sancho which were very clear, the rest I did not find anything special from the other Chelsea players so this must be noticed that in the end there must be some changes that must be made even though Chelsea are currently quite different when compared to last season but on the other hand they also still need to improve the quality of their team to be more worthy of being in the top standings this season.
I think Chelsea are on their way to peak form, and to be honest they are much better than last season. Enzo Maresca certainly knows his team potential well, as well as the weaknesses that he needs to fix in the upcoming matches. As time goes by, Chelsea seem to be able to compete with Liverpool at the top of the standings. Cole Palmer and Jadon Sancho are starting to be the main focus of Chelsea revival, and both players were important pillars when Chelsea beat Tottenham in the match week 15.
Chelsea current player composition is very balanced, although some of them look more prominent thanks to their individual abilities. In the future, with the chemistry that is increasingly formed, Enzo Maresca will have a more solid team, so that they are able to achieve victory with a clean sheet record. Most likely Enzo Maresca will be able to meet expectations, even though at first many people doubted his ability.
Certainly in this case it takes time but actually there are still some things and some players that need to be improved in several positions for Chelsea because in the end from looking at their current performance they are still not neat in minimizing performance especially for the defense area which is sometimes not very good and always easily missed in goals even though maybe this happens due to lack of cooperation and can be improved again but on the other hand in the end if this is left then it is certain that things like this will become more serious in the end.
Jadon Sancho is likely to be one of the players who will make Chelsea's performance better because previously they only always relied on Palmer but this season at least there is a change where Sancho can be another option and backbone for Chelsea because indeed his performance is still very good.
But overall I quite agree with what you say where their players for this season are much more developed and indeed it can be seen from the performance that is increasingly different from before.