Dortmund haven't had a great start to the season that's true but I think we'll see a stronger consequence of them for the rest of the season. Dortmund had a trend in previous seasons of always finishing in 4th place and it will happen again this season. Dortmund temporary ranking in the standings table is ranked 6th and the difference in points from the top 4 is only 2 points so one game in the future will be able to change Dortmund position in the standings table. dortmund have swallowed 6 defeats in the 15 matches they have played so this is a bad record for them because in 15 matches they have swallowed 6 defeats.
There are a number of reasons why I highly doubt this is the case because Dortmund has not shown anything so far that would give us any reason to believe that they won't cause any problems or have any problems, and that they will start improving soon. They don't even have a very competent squad right now. Not enough attacking options as well. I don't see any player in the Dortmund squad who can actually be a prolific goal-scorer for them.
I think they have scored enough goals this season. But the problem is they have not defended well. In total, they scored 25 goals and conceded 21 goals. That is just not good enough for them. Especially if they want to compete at the top of the Bundesliga table. They will have to perform well in all aspects of football otherwise they are not going to be able to compete at the top level of the Bundesliga.
They still hope that Haller's recovery will actually be a little difficult because when he recovers, he needs some other preparations, especially since he has to get used to being on the field again and has to hone his instincts as a striker later.
Dortmund's squad is not very good right now, the defense has lots of gaps, the attack line is not very good because there are no pure strikers there so this is clearly difficult for them.