I don't agree with what you say. In my opinion Garcia made too many changes all at once at the beginning of the championship and it would have been better to take advantage of a proven team, which had won the previous championship many weeks before it ended (and this explains the decline towards the end of the championship when they had many points advantage over their direct competitors and therefore had an understandable drop in tension), and making small changes and modifications to the formation and game organization during construction and based on the form of its players.
I don't see any special thing with Rudi Garcia performance in four Serie A matches with Napoli, have remaining 5 points left from top standings team Inter Milan looks he can't show best performance from Napoli. Actually is not easy how to be defend champion teams manager with Spaletti success made Napoli winning Scudetto and get many points left from Lazio who stand 2nd placed last season. However very early to claim with bad reputation for Rudi Garcia and need few matches later to see Napoli keep in the winning tittle race or he don't has capacity make Napoli defend their tittle last season. Have several important player left make him need new scheme and build up again Napoli as the winner mentality team and keep fighting for defending domestic league tittle.