Sorry. When started this inquiry, plenty of time. Now so busy cant think strait. Let me restate the question. Correct me if wrong.

The crater in the middle of http://www.lpi.usra.edu/resources/ap...e/?AS15-P-9625

It has a central peak that takes up a large volume of the crater. It is my understanding that central peak is formed from impact dynamics. This crater is imprinted over an older crater. To have a central peak so large wouldnt the energy of impact have made a bigger crater? Does the central peak being such a high percentage of crater voulume suggest different dynamics?

As in a high speed impact would pulverize and eject much material. For large volume of material to stay in crater suggest lower speed impact of a large body? Central peak may have some original asteroid and not pulverized material? Large pieces ejected as shards?

Just a thought from a laymen with no training.