The signing could as well mean that Borussia Dortmund are preparing for life without Haaland, that's not certain though as it could mean they are looking for support for their marksman, but whichever it is, it's a good acquisition for the team and I hope the lad can develop more in Dortmund. On another note, I don't think it'll take Dortmund too long to learn to manage without Haaland should he leave them, they are used to making/building quality players and then go ahead to sell them just when it looks like they are at their best moment, I don't know if they do it to make money or they just can't hold on to their best players based on the status of their club.