Chelsea should focus on improving their scoring performance in the Arsenal match. Because it seems like productivity is their main problem at the moment. For three weeks, the number of most goals scored in the matches has been only one. Actually they showed big weaknesses in defense against Brighton also but it wasn't a general problem if we take a bigger time period into account.
They have brought Aubameyang to increase their productivity rate. However he isn't performing like his performance in his first matches. He didn't score any goal in the last 4 matches he played. Actually he played for only 10 minutes in one of them but you get my point anyway. If he continues to play this much consistent he might not be permanent at the team I think. We might see him leaving next summer. I still believe that Chelsea need a more reliable striker to solve this issue.