Its defo not down to luck that hes been shunned away from United, was offered on loan and no 'top' teams with a good side came in for him.
Hes where he is at due to his own stuff. He can blame others as much as he wants, but overall hes been abysmal for United. Hes had backing, time off, and the such, and this was his third season at United. Or was supposed to be. The funny thing is, he would probably be playing right now for United and getting a chance to stink it up here, if his ego wasnt so big / fragile.
I actually hope he picks up form at Dortmund so that his value retains / goes up and United can cash in on him. Then at that point, whether he flops or succeeds is on him.
United should take blame for giving him a ridiculous contract. If he was unwilling to come to United unless we gave him 350k per week, then that should have been the first red flag. Heck, he should have been on less than 200k when signed (not sure what he was on before, but i wouldnt be surprised if it was less than 100k to begin with, so it should have just been an easy 'we will close to double your money if needed')
Anyway, thats the stupidity of United as we have seen over and over again with contract extensions (like we just saw with Rashford)