Bayern performance is extraordinary this season and I don't think that they are scared of any club be it Leverkusen or not. Leverkusen that has struggled to pick form and Bayern has been in form since the beginning of the season. It's only if Bayern drop form and start losing their matches before Leverkusen can take over the first position from them.
As you say, Leverkusen can only overtake Bayern Munich at the top of the league if they start to lose their games. Even if they haven't defeated Leverkusen or Dortmund this season, Bayern Munich is playing at their best. Bayer Leverkusen is still recovering from their worst form; they lost form due to the way they played last season, but they are returning to their greatest form, and they are presently four points behind Bayern Munich.
Since Bayern Leverkusen epic performance last season, people now overrate that club as if they can easily overthrown Bayern Munich the way they did last season.
After their performance the previous season, do you not believe that Bayer Leverkusen deserves to be overrated? You believe that people should stop expecting Leverkusen to take down Bayern Munich in the league after they achieved what other teams couldn't in previous seasons. People stop rating Dortmund in the Bundesliga, in my opinion, since they have failed a lot. They have been a rival of Bayern Munich for many years, but they are unable to compete with Bayern Munich's record after winning the league for 11 straight seasons, while I'm not suggesting Bayern Munich may still lose the championship this season, they also need to play consistently, Leverkusen shouldn't take over the league as they did last season.