Luck has not been on Chelsea side, they had to suffer their second defeat this season after previously losing to West Ham. The injury storm also greatly affected Chelsea appearance, Pochettino had to lose several of his mainstay players which made him have to develop a strategy with several substitute players.
If Pochettino can do something better in the dressing room then I think Chelsea will be even better. I don't know if Pochettino is capable of doing it, but he is a pretty serious type of coach. Pochettino has to solve very basic problems, so he doesn't have to think that his playing strategy is not good. Of course I expected a better performance from Chelsea, but I admit Pochettino is still having difficulty making it happen.
Well, everyone thinks that Pochettino performance is not very satisfactory, especially after he sold many players in the transfer market and recruited several players who are currently still having difficulty adapting to the strategy he is implementing. So their performance doesn't seem to have changed from their game last season.