Dortmund still has good strength this season but they are not able to maintain consistent performance, that is their problem this season but currently Dortmund have much higher motivation to finish in the top 4 so I think they still have a good chance big to win the match against Frankfurt especially since Dortmund will be playing at home.
Actually when Dortmund faces weak team their strength is seen but the problem has been exhibiting same strength when they get to meet a team as big as they are or in same capacity with them, this season I would just say they have more inconsistency around their performance than would have been expected of them considering their performance last season which show some kind of strength.
Bayern Munich actually performed really brilliantly today with an epic victory, I don't know if they are trying to create that impression that they are back again and probably on winning ways, but then they still appear far from the trophy this season because even Leverkusen isn't stopping with their wins too, but then Munich actually had a weak opponent so if they were able to use them to get back on winning ways it's not actually a real bad one, they actually needed a game as this to probably bring their minds back to winning ways again.
Dortmund has still got enough room for improvement and I hope they will make use of every opportunity they get to improve so the team will have, after this season there will be a break and there will also be open windows for transfer before the beginning of a new season so it's an opportunity for them of which if utilize well the team can Gain much more better strength for next season.