All these achievements happened to Leverkusen last season, but it is very unlikely that Leverkusen will repeat this again next season, although it is not impossible for Leverkusen to achieve it again with Xabi Alonso. Moreover, next season Bayer Munich itself will be handled by a new coach who generally will definitely need a little time in terms of adaptation and other things. So Leverkusen could put this to good use again in order to repeat what they achieved last season in the Bundesliga by never losing until the end of the season.
I see a lot of doubts about Alonso's success next season, but they kept the team together, didn't let any important players leave, and are also working on new transfers. And don’t forget that Bayer is a well-played team, and Bayern, who obviously could be their main rival for the championship, still have to adapt to a new coach, and maybe this period of adaptation will be enough for Alonso to try to achieve a starting advantage.