Honestly Dortmund have a serious issue, their bad performance is getting at of hands. It is so surprising that leipzig defeat them with a huge score,Dortmund was able to score 1 goal by struggling. For long Dortmund have not win any match and their performance is getting worse everyday. I don't expect Dortmund to loose this match to Leipzig.
I already said this before, i think that Dortmund was lucky quite a few times in this season already in matches that they have won in the end but where they were the worse team. For example against Cologne or in the first match against Leverkusen. I think that those lucky wins always kind of let people think that Dortmund is playing a OK or even a good season only looking at the points, at least in the Bundesliga. Their performances were very poor though in a lot of games also in the Champions League where they did not make it into the play-offs in a weak group and then in the Europa League they also were eliminated by the Glasgow Rangers.
I think Dortmund has a big structural problems and need to re-evaluate their general strategy. It is not enough to be a development club for young players of the really big football clubs.