This^^^^. Exactly what I see in my area. Seems the more dominate a buck is in a given area, they are the first to start losing their horns first. IMO I think it most likely is due to their body condition getting run down due to all the chasing and breeding they have done. On the other hand have seen some smaller, young bucks that still have their head gear still on their heads as late as turkey season.They always start dropping in North Arkansas in mid December. Not all of the bucks but if you have cameras out this is when they start dropping.