Every club has scouts around the world, but you see it time and time again with managers, when i player plays well against their team they take notice.
Rojo was basically brought because he played well for 90 minutes against Holland...so it might be that Schneiderlin have gone unnoticed due to LVG not being completely familiar with the Premiership.
I reckon you have underestimated Rojo"s performances for Argentina in the World Cup.
He was a hard bastard throughout their campaign and gave them fight and guts, a real warriors performance.
I believe he will do well for us.