Chelsea have the history of winning the Champions League in the condition of the team not going well in the English League, but this season cannot be used as a reference that Chelsea can repeat the same thing. The midfield is indeed quite crucial because it is the brain of a series of attacks that are trying to be built and if the attack line is creative enough in building attacks it will be easier for strikers to score goals. Of course all crucial positions in football and I don't think Chelsea have not lacked good players, it's just that so far it has not been fully maximized in contributing to the team.