Could Dresden now even loose the 5th place and become 6th in the end? Or is it not possible?
The ranking is by points, wins and then set ratio. So Potsdam-Münster 0:3 and Dresden-Stuttgart 0:3 would mean:
Münster 29 10 38:40
Dresden 29 10 36:38 so that should put Dresden behind Münster and Dresden could end up 6th with a Wiesbaden win.
Not too likely I guess