If Leverkusen had anything to lose, then they would not lose that game, they would beat Dortmund easily and would be great, but we have seen them not do that great, so we are not seeing them do any better. We need to remember that if they can do a good job at the middle, they could have done a good job at the end.
Leverkusen's performance since being eliminated from the UEFA Champions League has really dropped quite significantly. Even from the last 5 matches, they only got 1 win, while the others were 3 draws and 1 loss.
The defeat in the last match against Dortmund was actually quite annoying for Xabi and his squad. Because they really played attacking, but as we know, Dortmund's defense was very impressive in that match. More saves done executed very well.