As I said before at the start of this season, people expected to see a perfect performance from Leverkusen during this season even if they make one mistake that's not right because the Leverkusen fans think they should still stay unbeaten and they should still win the Bundesliga title while even a great team like Leverkusen can sometimes be made mistake and lose points but this is not a reason to say they are weak.
Bayer Leverkusen is one of the few clubs that I have come to respect lately. Their level of optimism and strong teamwork is one thing that has risen the club up to the position they reached last season. What I encourage them to do is to make the team more strong by adding more talented players into the club. If I was the manager, What I think I will do is to purchase a senior and star player.
Bayer Leverkusen is one of the clubs that opponents fear in the Bundesliga. Not all clubs can beat Laverkusen easily because they were at the top of the standings last year with good performance. It would be really good, as you said, that Laverkusen should add several senior players and star players, especially strikers and defensive midfielders, so that they can be more confident of winning this season.