Well if that's what the term means then I guess I just don't get why it would get a name. For instance, Shioda had terms that translate as things like "center power." Good name, I think. You use your center for everything, so that should be called "center power." But why talk about the elbow if there isn't something at work besides using your center?
There is not anything special other that just another point on the path of a connected body - external folks focus on the physical point of connection for their output of power and forget about the connected body - moving the focus to the elbow from the hand is just one way of getting away from that - albeit that may be more effective, there are other even more effective ways to to accomplish the same thing.