It's a moot point as I did not realize there was a sprocket with this ball polisher.If the platter was centered under the balls, each perimeter "ring" of balls would be getting the exact same constant motion and speed from the platter and they would have a tendency to want to spin on one axis. Because each distance from the center of the platter is rotating at a different speed (one inch from the outside edge of the platter is spinning a whole lot faster than one inch from the center of the platter is spinning), when the platter is offset to the balls this allows for the effective direction and speed of the platter to change in relation to any particular ball location and as the sprocket rotates the balls around its 360 degrees this causes every ball to be rotated around all axes.
Put more succinctly, as the sprocket rotates around this allows each of the balls to constantly encounter a different part of the platter that is going a slightly different speed/direction because of the platter offset which in turn causes the balls to be rotated about all their axes.