The Chavs will rally sooner or later they have too many good players. The big problem is if they then go on a run.
Chel53a will not win the league but I would not right off a top four place.
They would have to go on a run no one has ever done before ...
Honestly their big problem is with/without Costa, with him they have the goals, physicality (think the Jose/Drogba years) and threat. Problem is the guy will never be fit for a whole season