Pep thinks that the players he signed to replace these players he let go can perform to their standard or above their standards, but they couldn't, and the team is becoming unbalance if one or two players get injured especially Rodri. I think things will become better since their main man KDB is back from injury and will soon start playing with the rest of his team mates.
With the absence of their key players, mentioning players like Kelvin De Bruyne who's the main player that's been prioritize number one in Pep Guardiola squad. Manchester City have experienced some tough moments this season, I've watch them become vulnerable to their opponents and fixing this issue have grown to become one big problem for the citizens. Pep Guardiola acknowledged his mistakes and he's working effortlessly to ensure he grabbed golden opportunities to ensure things worked smoothly for his team and their path to success. Pep Guardiola have become one of the top coaches in EPL over the years.