There is a similar look here to Rolling Green as it relates to holes being carved out of the existing trees. I think that is #6 in the lower right portion. You can see how a wide corridor was allowed and the green was set in the opening. This was also done at RG.
#13 , on the other side of the trees has its green carved out . #4 has the carving at the tee, so it creates a chute like #15 at RG. #2 has trees on both sides but I understand Flynn was in favor of preserving trees whenever possible. I wonder if #2 has about 80 yards of width which seems to be Flynn's goal. #2 is on the far left of the picture with the fairway cut between the trees. The same planting pattern is seen in the 1930's Dallin photos of RG.
I believe he liked trees to separate holes, provide a backdrop, and shade on a hot day.