When I visited Alex Gilmore he actually showed this to me. He did by leaving a light scrach pattern from the DN slurry. When he made a tomo slurry he did a couple of edge forward strokes and let me see it through his microscope. It was removing metal in the front of the bevel leaving the cratches in the back intact. Then he did spine leading stroke and you can see it removed the scratches in the rear of the bevel. It is small but it did prove it was doing it and you could influence it by your stroke. The fact that a strop increased it made it clear to me that it is a actual thing to take into cosideration. You can "see" it better at 400 mag and a stereo microscope than on a video screen. The 3d is lets you see the depth you can't see on a screen.