If you want to add some muscle you really need a caloric excess. Some situations may stray from this but for the most part that's the breaks. Sometimes the mass gain is non-linear to caloric intake...one may need to take in a surprising amount to make progress. John Berardi's Massive Eating and our own Mass Gain are good places to look for info.
"Survival will be neither to the strongest of the species, nor to the most intelligent, but to those most adaptable to change."