whether Sébastien Haller will be like the next Erling Haaland..
I don't believe Sébastien Haller will be a product of Dortmund like Haaland. The quality of the two is quite different. In the 3 matches at the start of this season, Sébastien Haller has not scored or assisted. he is indeed an option in Dortmund's attack line. But at his current age, Sébastien Haller probably won't have a name as bright as Haaland.
Dortmund is indeed famous for the player business they produce with good quality. However, they always produce big names from their clubs.
Indeed that is the truth and Haller is just a striker who has been good enough to fill the striker position since last season. It is unlikely that he will be able to match Haaland and as the only striker with a high stature in Dortmund, he should be able to contribute again like last season and bring Dortmund back to victory. If we look at Dortmund's movements in the transfer market this season, they are not looking for an alternative new striker and maybe they will do so next winter.