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Every coach seeks stellar performance, and some clubs are already excelling, while others continue to struggle to get their players in for upcoming difficult games, that's how these clubs operates. Napoli's current performance is only uneven, but they are looking to improve in a short period of time. The new manager will guarantee that everything functions appropriately for the team. Simeone Inzaghi, the manager of Inter Milan, is a promising coach who is continuously looking for new opportunities. They're one of the strongest clubs in Seria A, and they don't give up quickly.
If there was a single manager on the planet who can give guarantees for something, I think that manager would be courted like nobody else. But guarantees have no place in sports. Goals yes, but who can give guarantees? That's a weird assumption you are bringing up.
I still believe that Spalletti knew or had a feeling why it is better to leave the club when he decided to terminate his work for Napoli. He has done everything he could and playing such a successful Serie A season could not be aced the year after, I think that is what he thought and he was probably right.
Spalletti is no longer in line with club officials in the transfer market, which is why he decided to resign from Napoli coaching chair. There was a lot of previous speculation that Spalletti relationship with club officials was strained, but we never knew the details of the reasons behind this. His choice to leave the club was the right one, and as you mentioned, Napoli will find it difficult to defend the Scudetto this season.
In the future, if Osimhen really leaves Naples, we can imagine their performance, even now they are having difficulty maintaining their position in the top four of the Serie A standings. Rudi Garcia should be given a little extra time, but management thinks differently in this case.
Walter Mazzarri will take over leadership of Napoli for the first time by meeting Atalanta, even though he had an emotional relationship with the club in the previous era, I think an adaptation stage is also needed here. This change of coach which is full of question marks is very risky, but we will see how they perform before really concluding everything.