If only they had reduced the number of sales of their quality players and kept more within the club to achieve, I'm sure they would have achieved something impressive by now and maybe they could have won the Champions League for the second time. But that's them, business is business, if there is a player who has the potential to bring in a lot of money they will not hesitate to let him go, even if that player is a very scary specter and has contributed a lot to them while in the squad.
And yes that's Drotmund with all its business. Lol
That's why Bayern Munchen was able to dominate the Bundesliga for a decade, there are lots of big names they have orbited over the years. In the end, Dortmund management always let him go in the transfer market, and the consequences for the club were very real, namely a decline in performance.
This season Laverkusen is a team that really deserves to challenge for the championship, and has the potential to break Munchen dominance. Xabi Alonso squad could be a serious challenge for Tuchel, the first three matches show they are very promising this season.