I really do not see how any of that language makes the situation clearer, but if it works for someone to have better understanding, then use it. Displacement to me just suggests that I am unable to do what I was trying to do. So it really does not take a lot of contact to have displacement. But if we are talking about off ball, displacement is the best language I can come up with to discribe what should be called. Because there is usually more contact allowed off-ball, especially when the players are both fighting for position. And just because a player is leaning on another player, does not mean you have a foul. Maybe we are talking about a Shaq type specimen and you are not going to easily move that individual in the post.
But that is 6 in one hand, half a dozen in the other.
Peace