Dortmund has not found its best performance and many people are talking too much about the positive results they achieved in several previous matches so that finally this week's defeat with a fairly big score occurred, there is no reason for this defeat because Dortmund deserved to lose, they played very badly.
Nuri Şahin must immediately improve, what he has done so far has not shown the best performance for the Dortmund team.
And for Stuttgart I think it also does not prove anything because of this victory, so far Stuttgart has indeed been a strong team but they have not been able to maintain the consistency of their performance.
It was a disappointing defeat for Dortmund at the hands of Stuttgart. Even though they would have lost the match on the basis of playing away, the number of goals they conceded does not speak of team that came to win the trophy. One would have thought that Dortmund would do very well base on their last season great outing at the Champions league. Just not encouraging how they allow Stuttgart and Bayern Leverkusen to pass them in ratings.
Unlucky day for Dortmund as they concede 5 goals even though when playing against a strong team like Bayern Munich they didn't concede that many goals that's why we call it unlucky day

Stuttgart are not the favourites as they started the season badly lost in the first match then drew in the second match and won the last 2 matches so we can assume Dortmund lost because they didn't expect Stuttgart to score in the first 5 minutes or we can call it a surprise in the early minutes that has an impact on the players' mentality.