Pat -
Agreed that there were several other boomerang greens at ANGC. The 9th was the most radical. I might define boomerange a little more narrowly than you. I see the 2nd and the 10th as more oval than boomerang. I have trouble seeing the 7th as boomerang. That green was Mack's take-off on the Valley of Sin and other features of the 18th at TOC. But using your generous definition, you might include the 6th as well.
As for trees, of course there were lots there on opening day. On the perimeters of the property and, mostly, in areas of extreme contours. (Think the trees to the left of 2, 5 and 8.) There were trees on the high ridge running above the right side of 10, 11, and 13. The important point is that trees (and rough) were not very significant strategic factors in the original design.
Might bad shots find trees? Yes. But they had limited strategic significance in the original plans. Two exceptions come to mind. The trees along the left side of 2 are a factor off the tee (the ones on the right side were added later), though interestingly Jones appears to have wanted them cut down to bring the creek on that side into play for over-aggressive shots. The other exception is the stand of pines at the corner of 18.
That's all changed now, of course. Trees are in play on any number of holes today. I suspect MacK is spinning in his grave over what happened to the 7th.
As for ANGC holding major tournamants - Roberts/Jones were eager to hold a US Open and, by implication, get on the "rota". Scheduling wouldn't permit it, so the Masters thing evolved. What they didn't originally think was that they would host a major tournament EVERY year. But, as it turned out, that's what happened.
But your comment touches on what I thnk is a more important point. For me the genius of ANGC is that it successfully pulled off a design that was interesting and challenging for world class players, yet not intimidating for the average player. High rating, low slope. A course on which, in the same group on the same day each playing their normal game, a scratch player might post his highest round of the year and the handicap player his lowest. It is a very small number of courses that can pull that off.
It was always critically important to MacK and Jones that ANGC be challenging to the best players in the world. It was never intended to be a only a quiet little members' course. The architectural trick was making it both.
Bob