#2 Sarri's predictability
Sarri's Chelsea are predictable to say the least. It is quite likely that any EPL fan can guess at least eight of the eleven players that will start Chelsea's next game. This may be put down to a difference in quality between the first XI and the second XI. However, the tactic, style and approach to every single game will also be known by any and everybody.
The style of play is predictable and so is easily countered by opposition managers. Tottenham in their victory over Chelsea showed that pressing Jorginho and David Luiz was a way to markedly disrupt Chelsea's rhythm and every other opposition manager has adopted that tactic to varying degrees of success. Meanwhile, Sarri has retained that style.
The substitutions that Sarri makes are also very predictable and like for like. Any regular Chelsea fan watching the game last night would have known at least two of Sarri's substitutions; Willian for Pedro and Barkley for Kovacic.
Sarri's Chelsea have started and ended every game in all competitions with the same 4-3-3 formation irrespective of the opposition and the results. It is a pretty poor assessment of the Italian coach who was hailed as a tactician in Naples.