I don't agree with you because a palyer like Juge Bellingham is important for any team and Dortmund surely spent too much for growing a palyer like him because he also had a good performance when he was playing on that team and now you can see this palyer is even shining in Real Madrid. But Drtomund can still be on top of table Bundesliga table with or without Bellingham in their team.
Good players results in brilliant performance for the entire team. Edin Terzic knows what's valuable gone this summer all because the club more interested in generate significant good figures in the transfer window. However there's always a ground to settle for what's left with them by recruiting new backup players that would definitely be ready for the market in the forthcoming years. Jude Bellingham was a prominent player for Borrusia Dortmund, gaining enough experience and playing like a pro on the pitch for Die Borussen Die Schwarzgelben.
You cant sure if there will be another bellingham to come again. Bellingham is bellingham. None will able to be the same like him. It likes you try to find someone who will be able to play as good as haaland and it will never exist.
Dortmund has been losing a lot of important figures in the club. I saw some names that were already recruited by the team but these names were not showing significant impact to the club. Real madrid who has bought bellingham for expensive price already got instant benefit from him.
Finding someone with a great talent in the football is not an easy task. Can we also expect to see barcelona find another messi?
Barcelona has also tried that since messi left from there but barca never got one. The same thing is just happening to the dortmund. Seeling its prominent players to the rivals are also making the team faced harder situation.
I expect this season is gonna be a tough competition for dortmund in bundesliga.