Chelsea match against Arsenal will be the stage of proving the quality of both teams this season. aubameyang will return to face his former club on the 13th matchday of the season.
Aubameyang will definitely be coming into this game with something to prove in his mind, considering the way he left the club, which wasn't an all that harmonious exit because he and the manager Arteta could were no longer compatible, it would be interesting to see if Graham Potter starts him from the off, or if he comes off the bench, personally i'd like to see him start the game from the beginning and see if he could get a goal, because i'd like to see how he reacts if he scores, whether he'll celebrate or not 
.Having said that, Arsenal are of course the favorites in this match, i haven't noticed any visible improvements in Chelsea's game since Graham Potter took over, they seem the same or worse, i know he has only lost once, but even in the games they didn't lose, the performance was not so good, Arsenal are in the best form of their lives and it will take quite a lot from Chelsea to stop them, but as a City fan i'd be glad if that happens.
I'm still wondering the moment Aubameyang scored for Chelsea win, whether he will celebrate in front of Arteta to repay his heartache for being dumped just like that or vice versa.
Arsenal came to Stamford bridge as the favorite team, Arsenal's performance was better than Chelsea when viewed from the results of the last match. In this game the pressure is on Arsenal's side, Arteta will have to get full points away from home to secure his place, while Chelsea will be very motivated to secure full points at home to keep any chance of returning to the top four.