Aubameyang played very well with Barcelona last season. He did not perform in any match for a long time. Even then he was able to play well enough with Barcelona. And I guess he will be able to perform well with Chesley as well. Aubameyang may strengthen Chelsea's forwards, but Chelsea's defense is also weak. In 5 matches they scored only 6 goals and conceded 8 goals. Hence, Chelsea management should take appropriate steps quickly to strengthen the defense as well. Otherwise, Chelsea should change their match strategy.
Chelsea got no problem with their defense line, where Chelsea has a problem is in the midfield and the attacking line, Reason being that , 1.both covacic and Joginho are getting weak they're no longer living up to expectation, hence the presure will be on the defense line and it will look as if they are the problem but they are not, Joginho and Covacic are no longer creating those chances for the wingers and attackers/strikers to score as like before.
2.while for the front line Chelsea was not having any good striker, who is always there to deliver (Timor wenner is a wasted investment), so it was majorly the wingers and sometimes defenders were scoring the goals.