..i find myself looking at that more and more....
..none of my scoots show that wear pattern whatsoever...
..i reckon a loose wheel could also have caused that pattern, and i'm also wondering about the seemingly off-center seal of your bearings...
..imma venture a guess here, that somebody has worked on that front-end...replaced the bearings, because they DONT look like OEM...and it's very easy to "smear" the sealing material that protects the bearing during installation...
..yeah that much is probably ok ...
..if they didn't properly seat either the wheel fasteners, or the caliper fasteners, i'd suspect that the disc could be subjected to wear in the way it has...
..think of a high pitch wobble, especially when braking...