Yeah Napoli definitely is a team that runs constantly I agree with that and yes Barcelona doesn't like those kinds of opponents, remember liverpool game last season. However its also a bit about being talented versus not. Don't get me wrong I am not saying Napoli is not talented, they are totally talented, what I am saying is they are just not as talented as Barcelona. So when you press that much and Barcelona tiki taka way out of that press with quick passes, they could find themselves very open because Napoli will be defending very closely which means if you can give and go type of passes very well you can find some space.
We will have to watch and see, its not a guranteed thing, Napoli beat some great teams and the first game was a tie, so nobody can say Napoli is definitely out, on surface it looks like for sure they are overmatched but its still a game to be played before deciding.
This is Barcelona change of a major silver wear, the likes of Manchester city, real Madrid, Bayern Munich, juventus are still in the competition, those team will be blockage if Barcelona meets any other them at further stage i don't think it would be Napoli to stop Barcelona, Barcelona would be facing Bayern Munich in the next knockout phases and that would be one to watch.