I obviously do not think that Aubameyang is not going to be a very useful player for Chelsea in the long run.
But at the same time, I also think that Chelsea will find a way to make him useful in some way.
There is no doubt that Chelsea will not become the best team in the league if they sign this player. However, I do think that he will provide some good stability for the team in my opinion.
It is true that Chelsea did have some difficulty scoring enough goals to win the game. As far as I am concerned, that problem will not be going to give panic anymore.
It is unlikely that he will be a game-changing player for Chelsea in the near future. But other than that he will be there to give Chelsea a more stable performance in the attacking lineup.
Aubameyang is a kind of player who will do well in any league he goes to, we have seen in past years how well he did playing in Germany, England and Spain and now coming back to England feels like coming back to continue from where he left off just playing in a different jersey. He has the ability to succeed in tough leagues, it will be almost as the same as when he played for the Gunners.