when off the field it has become a personal matter and what is important is the game on the field that can make Chelsea win the Premier League this season. Aubameyang is a very talented player and scores goals. Half a year at Barcelona in the Spanish league and before that Aubameyang was also still in Arsenal's uniform. This is a reunion for Aubameyang to be able to appear again in the English Premier League but with a different club, Aubameyang uses the number 9 shirt at Chelsea. At arsenal, Aubameyang was captain and was able to score 29 goals from 163 appearances and this time when he was in Chelsea uniform could he score more goals, of course this is a new challenge for him.
I do not think that winning the title or not wouldn't be depending on Aubameyang and I doubt that he would be a decisive factor for how they will do this year. I am not saying he is an unimportant player or anything like that, he is good, but he is not team changing level of good anymore for sure, if he was then why would Barcelona even look for another player.
In the end, they got Lewandowski, who is actually a great player, and Chelsea had to wait for the last day, because they couldn't find anyone better and they were stuck with Aubameyang if you ask me. Of course he would be decent enough that he will be a striker that they needed, but won't be too much of a deal.
It's true don't overestimate Aubameyang, I also doubt Aubameyang will be an important factor for Chelsea to win the EPL trophy. Aubameyang
can make Chelsea much more productive, but if with the arrival of Aubameyang Chelsea can become champions I doubt that. Because
in my opinion, although Aubameyang is a good striker, he is not the type of player who can make a big difference to the team's performance.
Moreover, with your explanation which I think is quite reasonable, Chelsea signed Aubameyang because it was a last resort after Chelsea's
main target failed to be obtained.
Even according to rumors Chelsea tried to bring in Rafael Leao at the end of the transfer market by providing an offer of 80 million euros,
unfortunately AC Milan refused Chelsea's offer and did not want to let Leao who was a key player at AC Milan. After the failure to bring in Leao,
Chelsea did not have another choice of striker but to bring in Aubameyang. Moreover, Chelsea also refused to pay too much to buy Aubameyang,
therefore Chelsea used a trade-in scheme to get Aubameyang. This means that Chelsea did not prioritize Aubameyang from the start,
because maybe Chelsea themselves are a little doubtful that Aubameyang will make a big contribution to Chelsea.