Pochettinno is kind but I'm not too confident in his ability to transform Chelsea but just maybe he is right about sending off all those players that left the club and the ones left will be in good form to pressurise other teams to climb up the table as fast as they can to bring worthy to Chelsea ones again.
So far Chelsea have made good moves in the transfer market. They have sold the players that need to be sold and kept the ones they need. They still have to sell a lot of players though but I believe they will do that before the transfer window closes
I also don't feel confident in Pochettino. I have always had my doubt about him. He was at Tottenham for about 6 years and couldn't deliver a single trophy. A manager with the kind of CV should be very questionable. Although he managed to make Tottenham into a top 4 club, but that was all they managed to be, a top 4 club.
If you argue that Spurs didn't have deep pockets that's why he couldn't succeed, he was also at PSG and even though he managed to win the league there, PSG played the worst football under Pochettino. They lacked rythem and they were painful to watch.
I believe Chelsea will be way better that they were last season but I think they won't make it to the top 4. The top 6 is what I believe they can achieve.