It still matters, let's see what happens in the next five games and then compare...
But they will meet Augsburg, Leipzig, Mainz, Freiburg...and Munchen.
The only level I believe Dortmund are not going to fall is their relegation but anything outside that they don't have a limitation, so actually I think they will fall a little more because of what they have to faced, so the few matches you said is what will justify it.
Even if they would be losing all those games, and every single game from now on, it's nearly impossible for them to go in the 16-18 area, that's clearly a push for fantasy land, Bochum has 17 points in 24 games, 10 games left and no way they could make 18 points to catch up with even a Dortmund that would not win a single point. That would be 6 victories out of ten games, no way!
But anyhow, if you're not in the top 6 or bottom 3 it doesn't matter where you are.
Yes, indeed many, because of that, Xabi also admitted that it will not be easy and they seem to need a miracle. And indeed as you said, Leverkusen so far also performs very well, beating Bayern Munich several times.
Bayer only once managed to get a 3 goal difference against Bayern in a decade, and it was the worst shape Bayern and prime Bayer playing.