Great post Jedburgh -- very informative.
I also never believed in the "one shot stop" theory either. It's basically a crap shoot. If the BG is high on drugs, adrenaline, rage, all three, etc. Not to mention an animal's will to keep fighting/fleeing when wounded. That would be both the 4 legged and 2 legged variety.
That's why not only shot placement, but quantity, is important IMO. Shoot to stop a threat means exactly that. Don't stop shooting until the animal is down, you're out of reloads, or you're stone cold dead.
I have rounds yet to fire before I sleep ...