>>Those scars looks rather like something hit or slided on that surface - possibly other plane fragments hit that fragment when it was desintegrating in the air - than holes/marks left by small shrapnels from exploding warhead.
>That is also consistent with an expanding rod. It expands as a continuous ring to maximum diameter, typically 45-60 feet before separating. Rod may be inches to feet long.
It's possible that those are scars doen by rods skidding by the surface, but for me it's more likely than heavy steel rods moving at nearly 1000m/s would cut trough any plane surface like hot knife trough butter, leaving clean cuts and not scars, at any angle. For me it looks like something lighter (like other fragments of fuselage) collided with this fragment. Or maybe some parts of missile body other than the rods. I can be wrong though, it's hard to determine without doing some experiments with 1000m/s collisions... :-/.