Napoli is the favourite to me as well. Their EL group is pathetic. Their coach is great. Their mentality is perfect for that team. They are calm and composed nowadays.
The thing is the coach has identified the starting XI he wants every week and he is not pulling people in and out of the lineup like a madman (Benitez).
It's hard for me to choose Roma over Napoli when you see Roma capable of conceding thousands of goals in a row to Bate or Bayer. How can a team like that hold on until the end?
Napoli still have key weaknesses, though.
Jorginho, not being properly accustomed to playing regista, is frequently getting himself too high up the pitch and leaving Napoli looking very vulnerable if they lose the ball in midfield.
He also doesn't react quickly to the ball being played beyond him and it is resulting in the gap between midfield and defence becoing too big.
It was partly that failure to react that made Napoli struggle against simple long balls against Chievo as it was Chievo players picking up the second ball in areas where a good midfielder who really understands his position would be there to collect the loose ball.
Napoli's centre-halves were also making a meal of dealing with long balls and are generally unconvicing when defending aerial balls.
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These are minor issues, though, compared to how Garcia often sets up Roma's defence.
If they were to play more games like they did against Fiorentina, they'd be very dangerous.