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.
Bayer Leverkusen seems to have the ambition not to experience defeat until the end of the season even though this is impossible to happen but Bayer Leverkusen is trying to make it happen by continuing to refuse defeat even though they see their opponents are quite tough, I am also very surprised how Alonso handles this club well even though it is clear that Bayer Leverkusen has secured Bundesliga title this season, he should play more relaxed here without having to worry, even if he loses, everyone will certainly understand it and will not insult Bayer's defeat in the Bundesliga.
I think in the next match when they meet VFB Sttutgart for the second time this season Bayer Leverkusen will still continue their unbeaten record even if they lose this match it doesn't change anything but it would be funny if Bayer lost at home while when competing as a visiting team they are still trying a draw, I think the next result for Bayer Leverkusen is a draw and Bayer refuses to lose again.