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.

After winning the Italian Serie A title last season the expectations of the Napoli fans from anyone who'll take over the club's managerial position after Luciano Spalletti left became very enormous and unfortunately for Rudi Garcia, he wasn't able to match the expectations from the club's management and the fans of the reigning Italian champions.
That being said, I never expected the club management to hire Walter Mazzarri who helped the club to the club to finish as the league runner's up 10 years ago. Hopefully he's gonna improve the performance of the team