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.
In fact, the strategy made by Rudi Garcia at the start of the season was not much different from the strategy made by Spalletti last season. It's just that the composition of players at the Napoli club has changed slightly. And this cannot be avoided because several main players leaving Napoli clearly could not be avoided in the transfer market yesterday. For example, Kim Min Jae, who has now moved to Bayern. And Garcia has to fill the position left by Kim Min Jae with another player whose quality is not as good as Kim Min Jae.
Currently it is still too early for us to make an assessment whether Napoli still has hope or not to compete for the title with other top teams. So let's see the next matches.
In two days Napoli have a match in the UCL against Braga. And if Napoli are still in good form. So Napoli should be able to win this match quite easily.