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It can be concluded that this season Barcelona is not in such good condition that their own performance has also declined this season. I'm not really sure that Barcelona will last long enough in the Champions League this season and I'm even starting to doubt that Barcelona will win another trophy in their own domestic league this season.
Let the doubts be yours, while the trust and confidence in Barcelona's ability to have a great season in the Champions League and La Liga belongs to the Barcelona fans. It is very unnatural if you and anyone else believes that Barcelona can win the Champions League title this season because you are not a fan, meaning that every time you talk about Barcelona there will always be negative sentiments that you will express.
I remember that no team that won the Champions League title had a smooth unbeaten run and didn't drop any points since the group stage. That's one fact in recent seasons, but I wouldn't say Barcelona have a better chance of winning the title than Bayern Munich, Real Madrid and Manchester City. Barcelona is just one candidate, but they are not the favourites. Barcelona's main task now is to prepare themselves to beat Napoli in the round of 16 and this is not easy, but they have to try to get through to the quarter-finals.
I also think that Barcelona are not the first candidates for the title. Some people just think so because they finished top of the group. But it's just luck they didn't end up in Newcastle's place. Then maybe they'd be out of the European Cups altogether.