(click image to play the movie)
Here is the comparison movie.
What I did:
- the black belt: duplicated, hid the original, parented the copy to the hip, so that you can see visually that there are hip changes.
For the clip though, I did parent the belt to the hip in your version to see what's going on, but there wasn't a difference. :(
As you can see, the hip reacts to the steps. Also pay attention as to how much weight is being put onto the hip, and if there's more weight, the hip reacts to it. This happens after x61, when he moves up faster, right before the next step.
I hope this helps!