Chelsea is actually very good at recruiting star players, Chelsea's only fault is in the coaches and club management who like to change coaches. not a useless player, but a Chelsea coach who can't maximize the potential of players. It's like what you mentioned Aubameyang and Kai havertz who said they were useless for Chelsea. Look at the goals that have resulted in titles in the past... See also Mohammed Salah and KDB being thrown out of Chelsea, what will become of KDB now at Man city?
What if Tuchel hadn't been sacked maybe the situation wouldn't be like it is today, while Potter and Lampard didn't match the expectations that the club management wanted, on the other hand the recruitment of many Chelsea players in the previous season also spent a lot of money and even more spending from Chelsea than the team Another EPL, so indeed this problem must be solved immediately so that the Chelsea club is not at the bottom of the standings anymore.
Pochettino includes the courage to train Chelsea, he is not worried about being fired via telephone like Tuchel who has presented the UCL. can he last long?
We don't know Pochettino's journey yet. I will not conclude that he is brave enough to take over Chelsea, but that is his job. If Pochettino is likely to be sacked, the Chelsea management will definitely do it again.