I think that the Aubameyang deal is beneficial for each side. Because Chelsea immediately needed to sign a striker before the end of the window. Otherwise a very tough season was waiting for them due to scoring problems. Aubameyang is one of the great choices available in the market. He is very familiar with the Premier League too so there wouldn't be any adaptation issue as well. Barcelona needed to get rid of some players to solve their registration problems in the La Liga also. Depay or Aubameyang was needed to leave and they reached their goal.
Correct me if I am wrong, but hadn't Barcelona registered all their new signings already after selling off some TV rights, or so I understand?
Any way, Aubameyang to Chelsea will really benefit Chelsea so much in terms of attack. The current forwards are not worthy of playing in a team like Chelsea.
Most chances they are already registered their all players because now they have no enough time for no registering player's we are heading for Champions League in next few days and now competition is also going to tough day by day in La Liga which need things must be completed if they already invested good amount in these finances troubled season.
Aubameyang is surely going to be beneficial for Barcelona with this they have this quality striker on free from Arsenal just because of bad management from Arteta, and now he is going to give them 30 to 40 Million euro amount which is good for them in current situation and Chelsea is also good place for him as already spend very long time in London with Arsenal and here he can give his best which is going to be good for Chelsea in these troubled days on and of the field.