Wow Tom...
I just spoke with Linc Roden TODAY about that very hole (He was out back while I was moving tees). He claims that it was meant as a copy of the 13th hole at Pine Valley, especially with the approach shot.
His rationale of course is that William Flynn built that hole at Pine Valley and then saw potential for it there. Apparently mimicking Crump's method of hitting spoon shots in order get the height of the green right up to the hill.
I belive you may be on to something though, having just reread the Tillie article, I can see many similarities.
Todd Anderson and I spoke of the possible changes to this hole, and he mentioned changing the tee angle to the right and nearer the present C-1 green. I believe that would eliminate the need to remove trees/clear wetlands while providing just enough angle to tempt the better player into clearing the creek.
Of course, the second fairway is mowed pretty far from the creek, so you'd probably have to extend it toward the creek for the shot.
BTW, both Linc and Todd told me that the carry through the fairway is 240 down the left side and the optimum play on the hole was to sling a low hook into the bank and let it run toward the creek.