Fiorentina have been a riddle wrapped in a mystery all season. Two wins from their recent five matches tells its own story, but it is the defensive numbers that should have the Curva Fiesole biting their nails. Eight goals scored is decent enough, yet eleven conceded at an average of 2.2 per game is the kind of leaky record that gets coaches sacked. Paolo Vanoli has returned to the hot seat after Fabio Grosso's three-match cameo, and while a new-manager bounce is possible, the structural issues remain. The Viola are not a bad side going forward, but they are a sieve at the back, and that is a problem when the champions come to town. Napoli, by contrast, arrive with the kind of swagger that comes from a settled squad and a midfield that can bully anyone in Serie A. The brief's history shows the Partenopei were backed with confidence in recent home fixtures, and while this one is at the Franchi, the underlying quality gap is undeniable. Napoli's recent results might not be spelled out in the brief, but the squad core of Lobotka, McTominay and Anguissa is the sort of engine room that wins these away days. They do not panic on the road. They suffocate. The momentum edge sits with the visitors. Fiorentina are still searching for an identity under a coach who has only just walked back through the door, while Napoli know exactly who they are. That stability matters in a fixture where the home crowd will demand a fast start but the away side can afford to bide their time.