Just because Leverkusen retained their manager and also most of their players by the looks of it, doesn't mean that they are going to be able to provide the same results. Sometimes you can keep everything exactly the same and you may still end up losing, we shouldn't really be worried about it.
I believe that the best thing to do would be just letting them do whatever they want, and I am sure that in the end they will do alright. Maybe they won't win the league, or maybe they won't win anything else, but I think it should be noted that we are talking about a situation that is going to be fine. I think it's clear, and we should be quite happy about it as well. Because we would be bored if one domination ends and another starts
Because Bayer Leverkusen managed to go undefeated last season and so, if the Bayer Leverkusen team still has the same manager and squad, then it is very possible that Bayer Leverkusen will still be able to get good results next season. Unless,if last season Bayer Leverkusen only had the luck to reach the final, then it is very possible that nextseason Bayer Leverkusen will experience a decline in performance. But indeed,any result is ofcourse still possible, but I personally am still very confident that Bayer Leverkusen still has the ability and a very big chance to get good results next season. Although indeed, having an unbeaten record is certainly difficult to repeat, but if only to get good results, I'm sure Xabi Alonso will still be able to do his best for Bayer Leverkusen next season.