The attack power on Dortmund's front line is very weak
Borussia Dortmund is a very good team. This is a team that have transfer structure, they don't just spend on player that don't worth. Though right now the club is going through a rehebilation process . They brought in Sébastien Haller, who scored couples of goals for the team .
Moreover they have the like of Marco Reus who is an excellent player to the team so I see them going far in the German Bundesliga this season and also in the UEFA champions league. Possibly winning it.
It doesn't matter what kind of players Dortmund has in its squad and also, it doesn't matter whether Dortmund can start the season well or badly. Because over time Dortmund always managed to recover but still, even though Dortmund managed to recover but that would not make Dortmund get the title. Just imagine, in every transfer window that Dortmund always sells its best players. But in fact, Dortmund always manage to compete well in the top four in the Bundesliga standings, even though Dortmund have sold their best players. Therefore, I personally will not worry about the conditions experienced by Dortmund because indeed, Dortmund have good management to produce great players in their squad.