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.
It is normal if many people doubt another big surprise from Xabi Alonso and Leverkusen because it won't be easy to repeat the same success. If they could be undefeated in Bundesliga last season, it seems hard to happen in the next season. Every team in Bundesliga must already learn the weakness of Leverkusen, they will try to defeat Leverkusen with harder efforts. Even if Leverkusen may still can handle them, but the chance for a lose is higher. However, I still favor Leverkusen to win Bundesliga title because Xabi still stays in Leverkusen and the squad is not so much different from the last season. Let's see if Xabi Alonso can repeat the success in Bundesliga.