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.
This young player has provided valuable things such as several goals and assists for Dortmund and he also made a lot of money when Real Madrid decided to buy him but on the other hand there is a profit from the sale of Jude Bellingham now Dortmund is having difficulty finding a replacement for a player like Jude. Bellingham because previously he has been one of the talented young players for Dortmund.
What amazing is that Jude Bellingham has only been with Real Madrid for a few months has been able to provide 5 goals and 1 assist at the start of the season in La Liga.
Maybe Dortmund and Edin Terzic also feel some disappointment over the decision to sell Jude Bellingham.