If they start struggling, they often keep struggling and it was what happened to them last season at the end and now it is happening so much earlier. But what's worse for them is how well Liverpool is playing and that Manchester City is now picking up steam after KDB now came back, Doku is about to be fully back and he will be in great shape again and then there is Haaland who will soon be back at full strength. By then, I doubt that Arsenal can compete with them for the last 18 games.
Manchester City is able to pull off a big fat winning series and if it's necessary that they win 100% of their games, they could do it. That's where I think Arsenal won't be able to do that.
For Liverpool and Manchester City may be a little more convincing because these two teams have good players and also both have experience in the Champions League. Arsenal also have great players but they are not mentally enough when competing in the Champions League and maybe this mindset they need to fix so that Arsenal can provide competition while playing there. If this condition is unable to be created then I doubt Arsenal's ability when playing in the Champions League against a far more balanced team.
Come to the FC Porto headquarters is not easy even though the quality of them is a little more draw, but FC Porto is a team that always plays in the Champions League so that their experiences are much better. Arteta had to struggle to get points in the match to make it easier for them when playing at the Emirates Stadium.
Mental weakness is the first thing people refer to when we discuss whether Arsenal can have a chance, but the quality of their players is not as good as that of Manchester City. Liverpool could be considered more equal in terms of the quality of the players, but they have Klopp in the background and I think if we compare the coaches, it becomes comprehensible that Klopp can be an important factor during a game. I don't think Arteta can yet compete with him. Klopp understands better how to choose his words in order to push his players even more.