I think Bayer Leverkusen start this season shouldn't be seen as a slow start because they lost their last match at home, they made a terrible mistake losing from 2:0 to 2:3 when they had opportunity of winning game but that shouldn't be seen as a problem unless they make the same mistake in their next game. Xabi Alonso should be prepared to make an adjustment and improve the performance of his team in doing his he should motivate his team to face the task ahead since they will be playing in the champions league and defending their league title would be the most important thing for them to do this season since the league is looking so difficult already.
Leverkusen's gameplay is very clear under the direction of Xabi Alonso, now it's up to Leverkusen's players to play a bigger role in maintaining consistency and improving the team's overall performance. The defeat to Leipzig was the beginning of their progress in this new season, there are still many matches that they have to play. The first defeat is not a problem for Leverkusen, moreover Alonso knows very well what he will do so that his team can perform well in all lines and get full points from match to match. Therefore, this season Alonso certainly realizes that it will be a big challenge to defend the title they won last season. It's not easy, especially since several elite teams in this competition are ready to compete until the end of the season. Especially Bayern Munich, although handled by a coach who still needs a lot of experience. But still, their chances are quite big to dominate the Bundesliga again. At least, it seems that this season the Bundesliga is more exciting because several teams are ready to defeat each other and become the top of the standings until the end of the season.