I would say Chelsea was quite unlucky throughout last season. Of course, we all know that every club would experience the same at least once in a decade. So for now it will make no sense if we keep pressing on the "WHY" of Chelsea's condition.
Many keep talking about Potter and Todd Boehly as the sole cause of the club's predicament while few speak about the way forward. I'm more worried about how the new chelsea would be in the next season, seeing that the club is already showing signs of a bad start by planning on selling Covasic and Kante.
Every team has a season of prospects, and despite the money that Chelsea spent on players, they still did not perform well. Chelsea wasted several golden opportunities and narrowly avoided relegation in premier league on like the Chelsea we know. You make a valid point about waiting to see if Chelsea's current developments can enhance the team's performance, but I believe that even if Potter gave it his all, the play itself was sufficient. And I can see that Mauricio Pochettino is sticking to his guns about retaining Kepa has is number one.