I agree that Serhou Guirassy showed an impressive very good performance last season and that Dortmund was very lucky as there was a few other Europe Top Clubs to get Guirassy.
Even i am a big fan about Füllkrug and Haller i guess that one of them will be leaving the Club.
Donyell Malen and Guirassy together can be very good combination for Dortmund to get fast forward on the field.
Dortmund continues to strengthen the team, it’s a pity that they were left without Terzic, but apparently he played his role in this team. All of Dortmund's new transfers look very good as always, and this is not surprising, they have long been famous for this. But I suspect that they are doing this not with the aim of trying to become a competitor to Bayern in the Bundesliga, but as part of their strategy, when after a season several of their new acquisitions were able to fulfill their potential and will be sold to other teams.
Last season, with Dortmund's performance, especially in the Champions League, it shows they really have a better squad. Now that they are signing some new players again to strengthen their team performance for next season without selling their key players, it's going to be a great opportunity for Dortmund to compete for next season's Bundesliga trophy. However, what I am worried about now is whether the new manager will be able to manage the team as well as Terzic, their former head coach. Sometimes, even if a team has quality players, without a good manager they will hardly perform well. But let's see what will happen next season. Maybe Dortmund will have a great opportunity to fight for the Bundesliga with other top teams which are currently in great form, like Bayer Leverkusen and Bayern Munich.