I understand why Welbeck will want to leave, but I do not understand why United would want to let him go. The only reason I believe is that Van gaal plans to drop one of rooney and van persie and play Di Maria in the robben role. But, I do not believe Van Gaal will do that because he is good friend with van persie and he made Rooney captain.
I do know that if Van Gaal persist on using Robbin Van Persie and Rooney upfront even with Di Maria, I fear we will lose out on champion league football again this season. I believe Rooney does not like playing with van persie and vice versa. Such an assumption is made after noticing again that Rooney only passed once to van persie the entire minutes that these players were on the pitch. If you are comparing them with the potent striking duo of luis suarez and sturridge, the latter made numerous one twos with each other, which seems non-existent between the pairing of rvp and Rooney. Out of all our attackers, Welbeck is the best partner for either Rooney or Van Persie, but in the 1-3-5-2, januzaj or di maria has yet to best tested. So perhaps those two could be as good or better. We will have to wait and see, but for that to happen, Van Gaal will have to drop either Rooney or Van Persie. Which, I am not sure he would.