I assume that's based on your extensive knowledge of body design and the single rating letter you from one vehicle? As I stated, If the car is designed to be able to deflect the energy it's easier, but most vehicles aren't designed to do that for such a shallow test as this. At this time, if cars do well on this test, it's probably luck (unless they are a brand new design as of this year). There's no other need to have so much structure so outboard on a vehicle besides this test. Volvo is the exception. The design for things IIHS doesn't even test for.
On the post test photos of a variety of makes/models I have seen, this test basically rips off the front corner of the car and causes damage to the front door hinge pillar and a-pillar. On some cars, it even rips off the outer skin of the door because there isn't sufficient structure far enough outboard on the vehicle to deflect the vehicle from the barrier rather than allow it to continue plowing through. Being very small/light does help though....