The way I understood grain blockage, and I maybe wrong, it is a symptom of starvation and dehydration. If you were without food for an extended period of time, the worst thing you can do is gorge yourself. They usually feed some one very slowly and bring body fluids up as well. A lack of water, stomach acids and enzymes, being weak from hunger, it takes energy to burn energy. The deer eats more than its body is ready to digest and gets clogged up. A deer, being different from humans, in good health always have a full stomach. I've never shot a deer with an empty stomach and many were full of corn. Having an empty stomach for even a short while will really mess with the digestive track of an animal that needs to fill up every 4-6 hours.
Those two deer were starving and the others that were shot have very little body fat according to one of the sharp shooters. Sure the 1 deer died from grain/corn overload but it had been suffering long before it found the bait pile. The sad part is the deer in Oshkosh are in better shape than the deer on some of the public grounds in the same county. Deer can't eat bare dirt even if they could get through the ice and snow.
What they need to do in Oshkosh is use food scent baits and guard the corn every minute it's out there. They need a Wack attack. lol Hopefully the 6 that the sharpshooters got were the 6 most desperate for food.
American by birth, hunter by choice.