Borussia Dortmund over the years have been a team that have nurtured young lads and later resell them for a huge sum of money when they have improved and matured in the game, so jobe Bellingham moving in such direction sounds good to him and his playing career because there's a high probability that he can use this borussia Dortmund moves to not just improve his game but also secure a bigger move just as his elder brother did. it's a big one actually for him and his footballing career so it's an opportunity that he should utilize properly if he want to advance his career to another level.
That is what they were lacking so far, at least this season. They had sancho, they had Haaland, they had Jude, like they always had a star potential player that went to play somewhere better (maybe except Sancho who picked united).
So for the last year, they didn't had anyone, who in Dortmund right now could be bought for 50+ million and a future star? Nobody. They lost their best players and they didn't had any and that is why this season was bad. They have to go back to that style and get some young stars and hope that they could do better. Well, even after losing Sancho and Haaland, they still had Jude and lost the title on the last game. So you have to remember that we are not going to end up with Dortmund finding success if they keep these players.