It's only been one match and we can't show anything and in my opinion what the Napoli management did in changing coaches was a big mistake because there is no new coach who can lift the performance of a team that is slumping without any process.
For this season there are no good possibilities for the Napoli team, they may lose their chance to win any title and it would be better for Napoli to proceed with their new coach to prepare for a better next season.
I know that, this is still one match played in the Calzona era. However, I think the draw that Napoli got in the UCL match was a good result because Napoli previously even lost to mid-table Serie A teams like Torino, Frosinone and others. We'll see in the next Serie A match. Of course, Calzona will not be able to change instantly like a magic powers. However, if the strategy is matches with Napoli player, we will see an increase in performance showed by Napoli.