Didn't it say that they didn't know if he was mauled by the bear before or after his death? In other words, the bear may have not been the cause of death - heck he could have keeled over from a heart attack in the excitement of bagging his deer for all we know!
I've been in that area. My brother's friend had a trapping line at that locale and he casually pointed out some grizzly bear rubbings on a tree by the little cabin. Gord tried his hand at hunting deer once but an experience with a pack of wolves got him skittish while he was dragging the carcass back to his truck. He hasn't been back.