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We don't know what the problem is even though Chelsea have great players and expensive but failed to reach the best place, maybe the coach's mistake?
The recipe for failure was already there from forcing Abramovich out of the club to the new owner's sacking of Tuchel and changing almost everything so it's not really that we do not know what happened. The problem is above the managerial level and Potter couldn't do much about that in just six months unfortunately.
There is no coach that will Succed in chelsea under this poor management and owner, Potter would have done better regardless of his inexpensive to manage big club, but the management was a big problem to him, they bring in players that are not mature enough to play for a team like Chelsea, buying so many yough stars and they all finding it difficult to adapt quickly to the league. That was the problem of Chelsea and it will still affect Pochettino if they don't give him free hands to operate.