If I had to guess when the D.A. developed, I would have to guess between 1920 and 1923. If you look at JMorgan's first b&w picture from post 3, that picture was taken between 1915 and 1919. I can tell that because this photo was published in Pine Valley's History by Warner Shelly on page 50 and it also appears in Harry Colt's book, Essays on Golf Course Architecture, published in 1920. In this picture I really don't see the D.A. However, in Tom MacWood's b&w photo from 1923( post 77) you can see the beginning of the D.A. As I stated earlier, it is not impossible for a hole like the D.A. to develop naturally on a plateau green in a short period of time with sandy soil and heavy rains. I told the story earlier about a bunker/hole that has developed, also on a plateau par 3, at my home course in the last two years from the heavy summer rains.