Frosty, I agree that I think in human terms, that is because that is all I know about.
According to my knowledge regarding humans, all the sugars in the body end up in two types of carbs, glucose and fructose. For example sucrose, table sugar, is a combination of both bonded together etc. Same goes for flours etc etc. What I tried to say is, why a dog replenishment is up to 85% within 24 hours with maltodextrin only and potentialy 100% with other carbs added? I know about humans that glucose goes to muscle first, then liver and then in to fat, I know that fructose goes to liver and then fat and I know that if you use fructose only and the liver is "filled up" then no matter if your muscles are empty and no matter what you will feed, fat storage is next. So, having this info in mind I wonder what happens to dogs that makes them in need of two or more carb sources to completely refuel.