Chelsea's poor performance is mainly due to some bad management decisions. It takes a long time for a new coach to stabilize a team. Stabilizing such a troubled team is no easy task for any coach. But the Chelsea management wants a quick improvement. This is not possible at all.
I don’t blame any of their coaches they signed or any player for their poor performance, in fact, I am putting the blame on the management and the owners for lacking patience with managers just because of the money they blindly spent on signing players and because they want quick results.
Take Arsenal for example; they spent some money for players, but they gave the manager some time to build his team, now Arteta is doing well since he was able to build his team and can now perform very well in all competitions. Despite Arteta not winning trophies, Arsenal management were patient, but I am sure they will win title next season.
Chelsea needs patient in order for the coach to build a strong team with a tight bond. Changing coach always will not yield to good result because the coach and the players needs to understand themselves and play together for long in order for them to be successful in future.
This season might turn out to be similar with the previous seasons where Chelsea is always battling to win matches. However, Enzo might make things work out faster than we thought but we should not expect too much from him, because he is new with the team. Victory does not come in just one day, take for example Manchester city, Pep have been in that club for a very long time and that is why they are the best currently.