Instead I would have guessed that they had singled out certain abilities that gives a team more possession of the ball, and that the bonuses just makes those abilities better (like passing and a few other abilities becomes 5/10/15% better).
It's a simple game.
So you think that drills for improving specific abilities like Creativity, Communication,or Passing can give more to ball possession or creating chances ?
Nay, those are more cosmetics.
It's just values.
55>50>45, the higher, the better.