In history, Bayer Leverkusen does not match the same success like Bayern Munich and in recent seasons, Bayer Leverkusen have not had same strength as Bayern Munich have. They sometimes can create pressure on Bayern Munich in Bundesliga but they even ended latest seasons with lower rankings than Dortmund and with less success than Dortmund.
Bayern Munich are in transition after losing Robert Lewandowski but since this summer, they already got a perfect striker to replace the Polish striker. Harry Kane is expected to help Bayern Munich dominate Bundesliga again. Bayer Leverkusen will be one of victims of Bayern Munich in Bundesliga again like many previous seasons.
Xabi Alonso helped Bayer Leverkusen to improve a lot in the past season but failure of the club in Europa League against AS Roma with Jose Mourinho shows that Xabi still needs more experience as a coach to win big titles. He does not have enough ideas and flexibility to change tactics when his players are struggling in a match.
Bayern Munich are the most successful club in the Bundesliga both in the past and recent times, and it might take a while before another team starts dominating the league from them, Bayer Leverkusen doesn't come close as a club that would take over, they might be performing well currently but as weeks passes we might see them dropping points and then Bayern Munich moving back to their normal position.
The club that's been a treat to Bayern Munich over the years and even supposed to be the league champions is Dortmund but they were very unfortunate last season and had sold their good players that would've helped them challenge Bayern Munich over the years.
However im impressed with how Xabi Alonso has improved the team to a better standard, they're playing with confidence and are currently toping the league and even regarded as one of the contenders this season, i believe with time if he continues with this good path he'll turn into one of the finest coaches and hopefully replace Jurgen klopp as Liverpool manager in future.