Mauricio Pochettino still has time to fix it at least until the middle of the season he has done his best even though we haven't seen the improvement
I'm sure the Chelsea target this season is finished in the top 5 obviously this is not easy but we can't underestimate them who knows their performance continues to improve.
I remember last season Arsenal also did the same bad at the beginning of the season later better at the end of the season and even almost won the EPL.
No, Arsenal last season was started quite good and they achieved many points, the mistake was happen in the near end of the season and Manchester City able to overtake Arsenal's position. Arsenal was only sign few players and most of their players are veteran, so there was no big change and they will with the same strategy.
While Chelsea, pretty much like a new club who has new coach and new players.
It doesn't matter about past results because of course, in this moment they must be able to focus on getting good results in every match. Also, I think Pochettino looks too dismissive of the process, so at this moment Pochettino failed to make Chelsea have good performance and results at the beginning of the season. It is possible, because Pochettino has been accustomed to the Premier League before when he was head coach at Tottenham in the past, so maybe it made Pochettino underestimate the process at the moment of the transfer window yesterday. That way, it will certainly be difficult for Pochettino to restore Chelsea performance in the near future.