The loss of FullKrug who moved to Westham some time ago forced Dortmund to move quickly to find a replacement, especially now that Guirassy is still injured so with the new season will starting in a few days, Dortmund immediately brought in Maximilian Beier as their mainstay center forward next season,
Even Dortmund lost Füllkrug to Westham and he is an awesome player for the long term i think they have done all right with Beier.
It was not only the injury of Guirassy that they tried to get Beier as they already haved him on the list for some time.
But now its for sure the best way to have another good young and talented striker that can play when the season starts.
Füllkrug played very well in Dortmund last year in my opinion. Dortmund made a good profit by selling him for a good transfer fee. Now they bought young Beier instead and will sell him for a higher price. If he shines well for a year or two, Beier can earn Dortmund big money. Guirassy will give the impression of being the other goal scorer.