Sure, while it is cool to beat Sporting, and then beating Berlin 6-0, these are great and definitely not the Dortmund we have seen all season long. But, we should also remember that we saw them lose to Bochum and Stutgart before these games too, so it's obvious that we are not seeing them suddenly doing better, it is not that clear yet. Maybe they will get better, and maybe they will get good results, but most likely assumption is that they are going to end up with terrible results overall, and should be seeing how things could get better in the end as well.
I do believe that we can't make this work any other way, if Dortmund wants any success, they need to recover with time and for that reason they will comeback later on better but need to realize this season is gone.
Before the match started, I thought that if Dortmund would have another difficulty in the match to get a victory and to be honest I don't think if Dortmund would win over Union Berlin especially with a very big score, this season there is nothing more we can expect from Dortmund and that's why it seems that the victory is also meaningless with them falling behind the top of the Bundesliga table very large, previously we know them as one of the title contenders but slowly they are now no different from mediocre teams who must to fight very hard to at least reach the UCL zone, this season it seems that their chances of ending the season in the UCL zone are very difficult, although it is still open, but I think it is impossible for them to achieve it when the other teams above them are actually more consistent in winning the remaining matches.