7) Diego Costa looks good, David Luiz looks shabby
It has been two years since David Luiz left Chelsea and also two years since Diego Costa signed for the Blues. However, upon his return to London, Luiz has shown us that he still has many weak points in his game. The defender is very indecisive on the ball and lacks the maturity to lead the Chelsea backline. Kurt Zouma looks to be the best bet to replace John Terry in the backline.
On the other hand, striker Diego Costa has had a fantastic start to the season. Despite involving himself in plenty of duels with the opposition players, it is impossible to expect Costa to improve his discipline on the pitch overnight. However, should he focus solely on scoring goals, Costa could run away with the golden boot this season.