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This shows why Dortmund could not beat Bayern Munich in the last 11 years. They sold most of their best players to Bayern Munich and we see the reasons. Selling best players already reduce their squad power but selling those players directly to their direct competitor is worse. They became weaker and their competitor became stronger, no chance to win Bundesliga.
It is true that Dortmund often sell their best players for a reason, but it is very bad to sell their best players to rival teams. because these players certainly know Dortmund's weaknesses so that from several players who were sold by Dortmund and bought by Bayern Munich, they certainly have many opportunities to beat Dortmund.sometimes sloppy team management like this can worsen the future of the team in the bundesliga standings and many dortmund fans hope that dortmund can occasionally dominate in this bundesliga to be at the top of the bundesliga until the end of the summer.