Leverkusen made history in both Bundesliga with a perfectly complete unbeaten season but their season is not perfect by this defeat in Europa League final. No three titles, no perfect unbeaten season in all competitions when they only have 2 last matches to get it.
Anyway the final ended, the unbeaten streak was broken, a title was lost but they will still have one last match, one more final match to play and get one more title. It's interesting to guess how Xabi Alonso and his players will return next season and will they make another shock next season in Champions League.
You are absolutely right, Leverkusen has Undoubtedly made history in the Bundesliga, all of us are people who admire the management of this team by Xabi Alonso and the way he put this team to be champions, the fact that they have not won the The Europa League does not take Away its merits, it will always be something that can be looked at from a very good point of view so that they can continue improving, and goals with a wide gap , then this helps Xabi and the team as a whole to not lose concentration and see Football , each game as a final.