Bayer Leverkusen letting Xabi Alonso join Real Madrid this season and also selling some of their best players to other clubs this season, I agree that Bayer Leverkusen won't be a problem for Bayern Munich next season, and Bayern Munich will continue their dominance in the Bundesliga league because Erik Ten Hag needs to build up Bayer Leverkusen's squad to the level where they can be consistent in winning their matches and challenge Bayern Munich for the Bundesliga title.
This is the type of situation that I never understood. Because, if they lost their manager then that is bad of course, but if they sold their players then they made money too, so they should be able to buy some players as well.
I understand selling Wirtz is bad for example, like he was a great player, but they made 100+ million from that deal, can't they just get another good player for that much money? They should be able to spend 100 million and get players that are at least as good, or at least they should be able to get some great players and amazing replacement for other places as well that they think they are weak. These are the things that confuses me, many teams that sell for that much end up not replacing that well, Dortmund failed at that too.