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.
Leverkusen always refused to lose, there were many matches they scored a goal near minutes 90 or injury time.
Yeah the upcoming match against Stuttgart will be interesting to watch, this season both Leverkusen and Stuttgart have improved a lot among other teams in Bundesliga. I think it will end in draw, but I won't really surprised if Leverkusen lose in this match.
They don't refuse to lose for a while, but they seem to want to make history this season by never being defeated and being able to win this season successfully without having to suffer defeat. Of course that will be an important note for Bayer Leverkusen, even though the match against Stuttgart will not affect the results of the standings. At least the targeted achievement can happen so that everything is according to Xabi Alonso's hopes in maintaining the fitness of their players, of course that will benefit them for the match against As Roma later in the Europa League because that will be Bayer Leverkusen's achievement on the European stage.