in the match against manchester city proves chelsea has not shown significant development. chelsea's defense looks weak, we know this match is just a trial for coaches to mature strategies for readiness in the real competition, but yes I doubt if you look at the preparations made by chelsea at this time, what they show with a bad appearance, then it is clear that for now chelsea is not ready to be a competitor to compete for the premier league trophy.
yes the weakness in chelsea's back line must be overcome immediately by buying good CB players and chelsea should be able to if you look at stable finances.
In all the games except the America game they have conceded two or more goals, but on the other hand it is very difficult to focus on defense when the coach makes almost a complete change of the squad during the game. I think that friendlies should not be taken too seriously in assessing the team and the players' form, but the general opinion about the team can be obtained, and so far I am not very happy with the way Maresca has transformed Chelsea. Now there are rumors that they may let Gallagher go to Atletico, in my opinion this is bad news for Chelsea...