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The reason is just simple that it will be maybe end like it was with Bellingham and Haaland , because other Clubs has more Money that they can use for players.
Dortmund hasnt any rich guy behind there back and have to make there one Money from players and stuff.
But yeah i guess Edson Alvarez can bring something special to Dortmund and the whole team.
The market value of Bundesliga are a little above the half of what Bayern Munich have BTW Bayern have the 1/4 of the market value of 1.Bundesliga.
Dortmund played their way with the tactics of making stars from young players then sell them with a good profit so they can bring more players and so on.
Right now, it seems that Edson Alvarez is the one that seems close to join Dortmund, he is young and might improve with the team. There isn't much rumours about other players to join.