Just imagine that Dortmund doesn't have the selling mentality and see what their squad and their legendary squad will look lik, let's just try to mention
- Lewandoski
- Aubameyang
- Sancho
- Haaland
- Bellingham
I know I have omitted many but the fact is that Dortmund doesn't want to build for long. They are simply doing what they are used to doing and what they think gives them results.
Dortmund is a team that has always been blessed with good attacking players and strikers. Just imagine if all these players you mentioned were still in the team; they would have been ahead of Bayern Munich for a long time because they are still trying, even though they are used to selling players just to make some money, which will lead the team to go down and become less competitive for some time before raising another one that they will still sell once he gets to his peak.
Marco Reus is the only player they left in the squad, probably because of his leadership quality, and last season they had Jude Bellingham, who could have helped the team this season, but they sold him to Real Madrid in the summer transfer. Now they are in need of a good and quality squad to help them compete for the Bundesliga title because they are now behind Bayern Munich, Leverkusen, and Stuttgart.