It's worth noting the board and Ole generally don't just look at ability, they look at the character and personality of the player too.
As it's been pointed out in previous posts Ole asks players about how is 'so and so', e.g. when Maguire signed, he would ask Rashford before they went for the player about his character because of playing with them at International Level.
With VDB, Ole has Van der Saar who spent an extended time at United, he knows the expectations, and VDS was obviously a very intelligent guy, it's why he is in his position at Ajax now too.
Bergkamp said to VDB it would be a good move, VDS obviously gave Ole the green-light, and they know it's not just his ability but also his attitude that is a match.
It's another reason people like Upamecano would make sense, with asking Martial and Pogba about the player who are both world-cup winners, the same can be said for Sancho (Maguire, AWB and Rashford can vouch for him).
Thiago obviously Mata and De Gea has played with at National level.
United are going for these players not just because of their ability but their compatriots who can vouch for them as people as well as players that they are a 'United player' as pundits generally say.
The transfer policy must have changed back to buying young players, but having the right values, hungry to win titles versus coming for a pay day like Di Maria who clearly didn't want to be at the club.