When it comes to performance decline, then at least Barcelona and Napoli are both experiencing a decline in performance at this moment . But indeed, although Barcelona and Napoli are both experiencing a decline in performance, at least Barcelona still has better quality. Also, when comparing the quality of the coach, at least Xavi is also still a better coach compared to Mazzarri and therefore,basically Barcelona still has a chance to qualify for the quarter-finals by beating Napoli in this round of 16.
Well, hopefully Lewandowski performance will also improve for the match against Napoli later because after all, atleast Lewandowski is also still a Barcelona goal machine. But ya, the point is Napoli made the wrong decision I guess because ya, Napoli chose the wrong coach to lead in an era like this and it was a mistake.
I am sure Barcelona may not lift the championship trophy this season but then there is the possibility of them placing themselves in a good position that can easily propel them to possible success.