in the abcense of carbs
he doesnt need 600 grams of protein, perse, but he does need calories to support his muscle mass... where des he get those calories? well, not carbs...i GUESS, you could go with fats for SOME of those, but you still gotta have most of it as protein
muscle takes calories, whether it be fats or carbs, to sustain itself, with a lack of calories, he wont hold much muscle... the gear will help reatin muscle...but its not fool proof