Hmmm. While your explanation is unquestionably true, I don't think you quite understood what the poster was asking. His question is, I think, about the sharp shadows behind ridges on the surface, not the shadow of the vehicle itself.
I think his problem is an implicit assumption that if you drew a line from the center of the sun through the spacecraft, it would intersect the surface at a right angle. In that case you wouldn't expect cracks on the surface to display in such relief. However I believe that assumption is faulty, and that the rays of the sun intersect the surface at a considerable angle.
This is not unlike seeing the shadow of a plane you are riding in on the surface of the Earth. Unless you are in the tropics, that shadow won't be directly beneath you. It will be off to one side. It will also be distorted as it is spread out across the non-perpendicular surface, but you won't necessarily notice that because of foreshortening.