Dortmund might not take too much risk from winter transfer. They are keen on choosing young players and grow them up. They are not readily to buy star players to replace other star players they just sell to other clubs. It is not a traditional style of Dortmund in transfer. Their scout team works very impressively and find many talented youth players. They also wisely on transfer negotiation and manage to buy such youth players at very cheap price.
Back to this season, chances for Dortmund to win against Bayern is very limited. The point gap currently is big enough and in general, so far, Dortmund don't show that they can manage to beat Bayern in the end.
Well, upon saying that I really think you are right and from Borrusia Dortmund Robert Lewandowski is from that club at 2010 - 2014 he was pick-up by Dortmund on Lech Poznań and by the time he was in Dortmund he surely polish his skills by the time he got to the club Bayern Munich, it was really a historic time, and now Erling Haaland is now spreading his wings ready to accept any struggle outside Dortmund.
Well, I am not really expecting they to be champion, and I like both team aswell, but I surely agree that the score right now is pretty much impossible to be catch, so expecting Bayern will be champion again.
Haaland grows up enough and sharpens his skills enough so that he does not feel happy in a club which don't have chance to fight for and win trophies.
He must go to other clubs that are bigger and more ambitious. Salary is matter of course but not the most important reasons. Players like Haaland are aiming at trophies, Champions League, Ballon d'Or and more. Dortmund can not give Haaland such things so he will leave with support from Raiola.
Well, I might agree with you again, Borussia Dortmund last championship was on the years 2011-2012, and Dortmund right now is not really aiming to be champion again, and Erling Haaland really needs to separate himself from a club like that, well wishing him a truly great departure outside Dortmund, well this is just rumors but Bayern is offering Haaland on their club, I don't know if this is real but I think Bayern could give Erling Haaland his big break that he deserve.