Also, I would think that ketone synthesis is preferred to spare the protein that would be needed to fuel gluconeogenesis. Most of us (even those who are quite lean) have enough body fat to fuel us if we were to abstain from food for a long time (I'm talking week+, not IF) without too many detrimental effects. If we had to break down protein to supply glucsoe instead of ketones, I don't think we would last nearly as long.
I guess this is basically the same thing you're saying... so I agree! Haha. I guess it also makes a good case for the fact that fat (and ketones derived from fat) is our default fuel.