Pre-season is a hard time to fully analyse performance. Matches aren't as quick or quality-filled as they should be, they often involve more than 40 players, good results against league rivals are put down to weak teams and it's all in a very unnatural environment.
It's a golden time for managers to assert team goals and spend quality time away from competitive matches to build an understanding for their team, but this hasn't been the way it's happened at Chelsea.
For seven years now the plans have verged from being logistically foiled to overly strict, and during a time of change, like almost every pre-season has been, there was just too much going on.