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.
Sure! Preseason matches are not a determinant of what the new season will look like. We've watched teams playing excellent games during their preseason outing but they fumbled when season starts. Preseason games gives the coach a privilege to test series of formation and their players ability, strength and weakness to know which area needs to be improved and work on before the actual season begins. Young players in the squad are usually given a chance to showcase their talents during preseason. Not only Leverkusen, every team should not be judged by their previous season performance and not even by preseason result.