I said something like this the other day, and was called mental.
I believe Di Maria was a 'marquee' signing. As much for Woodward's benefit as van Gaal's. He wouldn't say 'no' obviously, and I doubt 'force' was needed to persuade van Gaal, but he isn't treating him like a player he hand-picked and had a proper £60 million plan for.
Falcao, in my opinion, was 100% a PR exercise, and Herrera just seems like a long-term club target who effectively was part of the package for any united manager this summer (a bit like Shaw.)