I actually think that Leverkusen might have actually felt a little too much invincible. They had to get humbled. And in the Europa League final they got humbled. They had achieved a lot in this season. If they were actually able to win both the finals that were left, the Europa League final and the DFB pokal this could have been the perfect season. But that did not happen. I thought they would probably be able to finish the season without a single loss in all competitions. But they ended up losing a crucial match. But anyway I think what they have achieved so far is really good and not every club can say that they have achieved similar kinds of things. Taking the trophy away from a club that has been the champions for 11 years is definitely not an easy job. They have done that. The Europa League might not have ended as we expected but I think the DFB pokal is actually going to finish in favor of Leverkusen.
I think also Leverkusen felt too confident and that is why they lost Europa League final. They had great season but they needed to remember that no team is perfect. Winning both Europa League and DFB Pokal would have been amazing but losing the Europa League final shows that anything can happen. Leverkusen did something great by beating team that had won 11 times in a row. One loss shouldn't hide how well they have done. I think they will try harder and maybe win the DFB Pokal which would still make this a great season.