Bayer Leverkusen's fate in the Bundesliga next season will be determined by their performance in upcoming matches, which I mean the pre-season matches, there are 4 matches:
1. Bochum - Leverkusen
2. Fortuna Sittard - Leverkusen
3. Leverkusen - Pisa
4. Chelsea - Bayer Leverkusen
Let's just see how Leverkusen performs in those four matches. If they can get good results, then we can expect Leverkusen to perform well in the Bundesliga next season.
Absolutely disagreed with you in this. You shall never use pre season result to forecast their future. You don't know whether they will play with the full squad during the pre season. We may be seeing some juniors to take a chance in the pre season. The better for you don't take the pre season result seriously. There may be the adjustment to happen in Leverkusen's squad as well. Impossible to believe pre season result will determine their future due those reasons.