Pochettino is going to start his job at Chelsea by the 1st of July. Chelsea should be entering a completely new period from now on. We shouldn't be seeing anything left from Potter's time because it was just horrible. Potter wasn't a manager who had experience with a top team before so it was some risk to take for Boehly.
The results of this risk were really heavy for the team as they couldn't even finish the season in top 10. Of course not all the time this kind of managers fail. For example Nagelsmann did a really great work with Bayern Munich in his first times. But here it was the right call to sack Potter after all that poor effort during the season.
Pochettino will improve in the Chelsea squad team so he will choose several players who will enter his squad team, I think Pochettino will also look for new players who are worthy of filling the Chelsea squad team as well as of course there are several players Pochettino will get rid of because they don't fit Pochettino's desire to make Chelsea rise next season.
I think this is the best step by having a new manager for Chelsea at the start of the season and it also seems that Pochettino may need time to be able to revive Chelsea next season to become a club that is respected by other clubs, Chelsea's rise from adversity depends on how Pochettino chooses players in the team squad Chelsea.