Rudi Garcia has been sacked, they called back Mazzarri after 10 years.
Conte is rumored to have refused them, twice.
Finally, Napoli fired Rudi Garcia.

It makes sense, Rudi Garcia never improved Napoli performance. We even heard a rumor about bad relationship with the players. This will have no solution, firing him is the best decision.
I'm surprised Napoli hired Mazzarri. I think there is no very special thing with Mazzarri when he was the manager of Napoli in 2009 until 2013. The only thing that he can achieve with Napoli was winning Italian Cup in the season 2011-2012. But Napoli may have no alternatives for the coach, so they decided to sign Mazzarri.
It is very unfortunate Conte rejected the offer. :-
I feel very sorry for Rudi Garcia, he wasnt a bad person. However, he was unable to make Napoli work. Zero.
I am also sorry that Antonio Conte didnt accept, it was a great opportunity for him and for Napoli.
At this point it is better for him to keep Mazzarri close, who in any case is an excellent coach!