Barcelona wasn't in their good form, but it's a big joke if they're lose against Shakhtar Donetsk and Royal Antwerp because both of them are in different level. If Manchester United was in this group, I believe Manchester United will able to qualify for knockout stage.
Either Barcelona or Napoli win the match, their next match is against Arsenal which I think they would lose.
In the UCL the first round will be in Napoli, so losing it is probably realistic. But the best thing is at least they don't lose by more than 1 goal. I also still feel confident that Barcelona could have drawn in the first round. So they have points for the 2nd game at Camp Nou. Besides, the game is still February. There is still a transfer break that can be taken advantage of. For Napoli and Barcelona I guess Barcelona will win and continue the round of 8 big teams.
I think Barcelona should be able to beat Napoli easily and there shouldn't be any issue at all. I think the best thing to do in this case would be just assuming that it would be a good period, and we could end up with something that should benefit everyone. I get that the best thing to do in this situation would be just assuming the world is not ending, you don't have to pay everything all that easily but you just have to assume that betting on Barcelona is a great way to make some money.
I am not saying that it's guaranteed, Barcelona could still lose, not like they are having a wonderful season, but they are certainly doing much better than Napoli has been doing so it should be a win for them without a doubt.
I don't think the match against Napoli is actually going to be easy for Barcelona to be honest. Barcelona has been facing a good amount of problems this season. Napoli also has not been the best of teams lately but the thing is Barcelona also has a lot of injury problems as well. Actually, both of them are going through the same kind of problems, to be honest now that I think about it. Both of them have to defend the league title and both also have to do very well in the Champions League as well. And both have the same kind of problems except for the fact that Barca has a few injuries. Barca is falling off in the La Liga pretty badly, to be honest. So I also think Barcelona might think about giving the La Liga a better chance instead of the UCL. Anyway, I think the match against Napoli is going to be competitive.