I also thought like that but it seems we were wrong about Leverkusen and they continued to progress without ever tasting victory. But at the moment there are still a few matches left and if we talk about the next match against Stuttgart, I think Leverkusen can still overcome this. The reason is that in the first meeting at the start of the season, Leverkusen did have difficulty facing Stuttgart but they were able to stage a comeback win in the 90th minute and that was enough proof of how their mentality works.
Not only against Stuttgart, Leverkusen has repeatedly survived defeat with a last minute goal and I think that will still be the case against Stuttgart in the second round. Although there are doubts that this will be Leverkusen's first defeat this season, I still believe they are capable of continuing their unbeaten record.
In the Bundesliga at the moment there is only one intrigue left, whether Bayer will lose this season or not. And Stuttugart is one of the last strong rivals for Bayer this season, but in fact Bayer is already a champion and a possible defeat will not affect anything, unless Alonso and the team want to set this record, and go through the entire season without defeat. Stuttgart will have to play away, so it will be more difficult to do, but if this happens, the fans will forgive Bayer for this.