Anthony:
From the crest of the hill down to the bottom must be something like 50 feet. We shaped a couple of little decks on the way down so that balls would have someplace to stop. If you hit it right, you could go way on down the hill, but not many people would be able to get ALL the way down and then Garland's analysis might apply.
Since most on the DG have never been to Cape Kidnappers, I'd liken this slope to the tenth at Shinnecock for comparison. Interesting that no one really mentioned that hole as a "speed slot" either. I guess we think of it as more of a "hill".