Signing Rashford is the best thing Flick has done to Barcelona this season they missed signing Nico Williams so getting Rashford even though its on loan is an opportunity to strengthen that wing since I heard he wants to use Raphinha as an attacking Midfielder. Rashford would add lots of strength to their depth and he's already fine in the training ground.
Rashford should be one of the best decisions for Barcelona, but as for me, only when I see his performance on the pitch will we be able to tell if they are lucky or not because when they are buying him, they are buying him with the intention that his presence should actually improve the performance of the club, so Rashford needs to improve the club's performance because when they don't, then it only makes things worse for them because there are players that are not making things better in the club.
But I don't think Rashford will do anything of the sort because he knows the reason why he's there because he knows the situation of Manchester United, so he would not want the same thing to play out well for them, and with all this, I cannot wait for the new season to start.