As an outsider looking in, it seems like this. The Owner bought a player that the coach in place did not want and advised against. This coach was fired once he started placing this player on the bench. Interim comes in, wants the job and does what is necessary to get it. ie plays the player. he then gets the job on the back of results, drops the player, now he is in the big seat and as a consequence gets the boot.
New man steps in, wants the job, has a history with the player and will do as the boss wants, simply because he has little to lose by doing so.
for Chelski fans