Leverkusen was one of the best teams in the last season and they had a perfect performance thanks to Xabi Alonso in this team they didn't lose any games and they were the best team they could be in the last season but still, the performance of this team during the last season was not good enough to make them be the first team of the Budesligatable again.
However,r Bayern Munich also improved a lot and maybe the reason for Leverkusen to lose the race during this season was just Bayern Munich having a new coach and being in better form than last season.
I knew it will be very difficult for Bayern Leverkusen to repeat their last season's record in a league that have a club like Bayern Munic that were enraged by their lack of trophy last season. I feel that Leverkusen already knew this and have decided not to fight for the trophy this season even though they are still making efforts. Bayern Munic indeed came to win this season as they are playing with all their might in every match and if they had their way, they would have won all their matches but because things does not always go as planned in football, they have to lose some points too. Despite that, they will definitely win the league this season to reclaim their position in the German Bundesliga.
You could see it that way but at the end of the day Bayern Munich will win the game as it is the most easy job they can do. Bayern won the title in the Bundesliga like forever. There is nothing to expect that this will change unless Bayer Lerverkusen retains the pressure.