It was Leverkusen that ended Bayern long line of winning Bundesliga title every season. For this season, the title remains with Bayern Munich, Leverkusen are still figuring ways of returning to the competition, they are not prepared for the season which we can see from their performance this few games. Well, important players were sold and new coach was brought in, i know the team shouldn't be expecting much right away, if they make top four that is a best recovery achievement to end the season.
Leverkusen are starting over. Xabi Alonso and Erik ten Hag have different systems you know. They don't adopt the same game plan. So it would take some time to get better...
The championship odds:
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Bayern Munich: 1.29
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Leverkusen: 8.50
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Dortmund: 11.00
As a result, it would be a big surprise even if Leverkusen win the Bundesliga this season.

The board would expect ten Hag to finish in top 4 at worst. The Champions League qualification must be a crucial target at this point.
Winning the Bundesliga? It would make him the king there for sure...