If some one had a pic of an antler with the hole on the inside then the bot fly might have some merit, but bot flys arent found all over the us. We dont have them here I think, so to me its apparent, the outside beams are the area of the holes, Ive just heard from to many reliable sources about branches and twigs. If you look in most holes you will see were there is still velvet, that the buck coudnt rub off. That in turn....if theres velvet then there shouldnt be any velvet in the center......If that makes sense.
Brett