I was surprised Dortmund lost 4 goals and couldn't make a goal. Even from the start I was sure that at least Dortmund could draw. I see the actual stats there is not much difference in ball possession. It's just that Bayern is more effective, 5 shots on goal 4 become goals. After losing in the DFB Pokal 1-3 to Saarbrucken, it seems Munich is not too influential. Harry Kane was also outstanding, three goals and that proves he is Munich's best transfer. He played so amazingly. Every game he is more and more integrated with the team.
But basically Dortmund didn't play very badly either this match because anyway, Dortmund only weak or didn't have a good shot on target this match. But for other statistics, at least Dortmund can still provide good resistance too. So ya, with statistics like that then Dortmund should not lose with such a big score and moreover, this match Dortmund played at home. But with this result, it is clear that Bayern Munich is really focused on maintaining its consistency in the Bundesliga, because Bayer Leverkusen is also still firmly at the top of the Bundesliga standings. Therefore, it is appropriate for Bayern Munich to be able to keep the points gap with Bayer Leverkusen not to widening.
Regarding Leverkusen, I think the performance Xabi Alonso had in this team was really good and now Leverkusen is in first place in the Bundesliga table while didn't spend too much money like Bayern Munich did this season with Tuchel and there is still a two-point gap between them and Leverkusen.
Also, the next game for Leverkusen in the Bundesliga is not hard because Union Berlin didn't start the season well and they had a disappointing performance so far.