Very cool.
So they just burn any extra carbs they eat. Why would the body choose to burn the carbs vs/ taking them into the muscle? Too little/much water? Too little/much slin? To little/much diruetics? etc...?
There really needs to be a glossary of bbing terms:
--Flat
--Depleated
--pop
--ILS 
I always just read over these terms...but I'm kinda sick of not knowing exactly what people are talking about.
One reason is that an athlete will keep cardio up until the last minute, and their body is in "fat-burning" mode...when they start introducing carbs...it's like throwing gas on a fire...the bodies natural reaction to this huge inflection of carbs, is to burn it off.
Another problem is that many will use simple sugars to load, which will also tend to get burned off as opposed to using complex carbs which will load slower, but better...
I think guys tend to forget that it will take longer than 3 days to replenish glycogen supplies, when they've been on a depletion diet for the better part of 12 weeks...
Why do you think so many guys look great the day AFTER a show? Hell, even a week after a show? Because they have gotten back to "normal"...and they've had 4-6 days to carb load.
These are a few examples, but you get the point...