JMorgan,
Are you sure the photo is labeled correctly ?
Can you tell, by looking at the photo, that it's definitely # 9 ?
# 6 had an interesting tier at the back of the green
The foot pad to # 9 green would seem to negate it being a hog back, especially if you examine the hog back greens that CBM-SR-CB designed, and the length of their holes that had hog backs in them.
Since Tom Doak, with Pete Dye, worked on Piping Rock, perhaps he's familiar with the history of the hole[/b]