We're also talking about two different things. I'm talking about the number of trophy bucks in an area, what areas produce the most entries, as in my Carbon Co. example, you're talking more about individual animals.
I do agree with you that there is variation between animals. Not every animal in an area has the potential to be a monster buck, but talking about area to area, I don't think genetics of the population in a given area plays the giant role most hunters assign to it.
The biologists I talk to lately are much more talking about the factors I mentioned. Dr. Kevin Monteith at the U of Wyoming has written on the nutrition - horn size connection. See if you can find a link to his papers GROWTH OF MALE WHITE-TAILED DEER: CONSEQUENCES OF MATERNAL EFFECTS in the Journal of Mammalogy and HORN SIZE AND NUTRITION IN MOUNTAIN SHEEP: CAN EWE HANDLE THE TRUTH in the Journal of Wildlife Management.
I don't need to look up the work you suggested, I've listened to Kevin's presentation on that in person at a commission meeting. No question better nutrition, condition of the mother, etc. play a factor in producing better antlers/horns...but that's a long way from producing a B&C buck.
In the study referenced, IIRC, none of the bucks in that controlled study ever reached B&C size. Wonder why that would be?
If genetics play no role, then why do captive breeding facilities pay astronomical prices for deer that produce large B&C sized racks? If all it took were minerals, better foraged, etc. then any old deer would work and no need to pay out the nose for deer with better genetics.
Also, another example of genetics, rather than mineral and forage being the bigger factor is Montana bighorn sheep. Most all the transplanted bighorns are originally from the Rocky Mountain Front. That genetic strain has been transplanted to the Bitterroot, Blackfoot, Rock Creek, Anaconda, Missouri Breaks, etc. and even into Wyoming.
Funny thing...no matter the range changes, over vast amounts of country, a disproportionate number of the rams from that genetic strain of sheep are B&C sized rams. Including the rams transplanted from there to Wyoming.
Yet, the rams that came from native WY rams, in the same area, rarely reach B&C size...It sure isn't the mineral or range conditions causing that.
If its not genetics, then what explains it?
Another example is the whitetails I grew up hunting in Montana. The area I hunt, a vast majority of the whitetail bucks I kill have main beams that top out at 20-23 inches. My family and I have killed a boat load of bucks between 4.5-9.5 years old in there...and that genetic trait for modest main beam length is dominate. The country 15 or so miles to the north...bucks in that country have much longer main beams. Food quality, minerals, habitat type, forest type, all that stuff is identical.
Could it be genetics? I know it is.
If all it took were good minerals, forage, and a healthy mother...record book entries and B&C class animals would be much more common. Fact is, it takes great genetics for an animal to ever get there.