Good stuff!
Maybe it is just me...but how come no one considers the other factors in game recovery?
"Open type" country, bald knobs, sparse aspen groves, country where you have a good chance of watching the animal for a good distance after you shoot weights heavily in my book.
Moist soil that shows tracks helps too. If you have snow in your favor you have a huge advantage.
Do you have just a couple of animals to deal with or a couple of dozen...the confusion of tracks can make or break you.
Also, if it is early in the day then you have lots of time to unwind the puzzle. Shots that I may take in the morning I may not even consider close to dark.
I imagine most of us with experience factor these and other considerations into our shoot/no shoot decisions.
To me, the animals body position is important but there are many other things that will tip me one way or another.
Bob