"With Crump's death in 1918, it appears to have appeared and completed its migration after he was gone, so someone else had to construct the original. The migration and reconfiguration had to be done by someone else as well.
The contrast with the initial photo posted by JMorgan and the photos on page 60 and 215 of Geoff Shackleford's and Hunter's books is quite striking, and, in complete contrast to what exists today.
It's a nice mystery to try to solve."
Pat:
I think what we are looking for first is when that bunker in that position first appeared as something resembling a bunker. If we can logically get that date into Crump's lifetime then it can probably be assumed the idea was his, and in that vein I really don't think we can discount the significance of that little round red circle on the "blue/red line" topo map in the area the DA would be in or was in during his lifetime. As I just said there was little to nothing on that course that was drawn in in red that was not constructed in his lifetime.
Next as far as what you call the bunker migrating we can look into that next over any time span. We surely do know that Crump changed many things out there during his app five years working on the course with Govan pretty much all the time and the record shows had he lived it was his intention to keep on changing things on that course until he felt he finally got it right. There is a very fine chronicle compiled by his two closest friends down there what he intended to do had he lived. There is also that famous remark one of those two men closest to him that when Crump would be asked why he was taking so long and when he would finally finish the course he would bellow "NEVER!!"
"Lots of pictures up at Pine Valley clubhouse that show the changes to the architecture, however they are not for the most part dated, making analysis fairly difficult."
Depending on any particular picture, and certainly of PV there are all kinds of nuancy and interesting little ways to get photos into a pretty tight timespan if it is undated. That's some of the finer points of what historical architectural analysis is all about. There are a fair number of people who have some pretty good experience at it but of course being intimately familiar with the golf course and all the details of its history in any given time is sort of essential otherwise one wouldn't even know what to be looking at or for.