Congrats, great elk! You might mention the outfitter, the good ones deserve some accolades. Camp looks clean and comfortable. Hope your wife enjoyed the back country.
My wife said it was the best vacation she has ever been on, now that is saying something. We saw moose, deer, a grizzly bear and cub and elk. The elk were in heard of 60-70. Food was great and the guides, wranglers, cooks and the staff at the ranch worked hard to make our trip memorable and they were successful. The view from the cabin at the ranch.
I would think if he is comfortable on/around horses he would do well. I also ask my wife and she said yes. They take down to 5 on summer wilderness pack trips.
So you know your son and can go from there.