I always assumed (and perhaps naievly) that since these are suppose to be "Eagle Palms" or feathers, that a silver or white eagle palm would indeed be rarer than say a bronze or golden one. I can only think that such a feather would come from the head of a bald eagle therby making it above all others. (i know its kind of sappy but it works for me.) Looking at the military insignia for american officers in all the services, when there are 2 similar insignia for dififerent ranks (2lt & 1lt or major and LtCol) the silver is always higher. all generals and admirals add silver stars. Since I alway try to downplay any "para military" appearances of scouting, I will stick with my original explanation.
