400g of protein is only 2000 calories. Assuming someone has a BMR of about 3000 calories, then combined with the energy expendature of workouts you may burn another 300. That leaves 1300 calories from carbs and fats. Then of course to gain some weight you're gonna have to go over this number. He's already said he's always been lean and skinny so I doubt he's even eating enough to gain by what he's said so far.
This sounds a bit like DC's diet plan which many seem to be having great success on. Down double your weight in protein(better to get more protein than needed and waste it than to get less and possibly slow muscle gain. Pro also has high TEF so it's safer to get extra calories from it versus carbs or fat), eat it first in every meal and then fulfill the rest of your hunger with some fat and protein, preferably of the good kind. If you eat 6 meals a day thats 60-70 grams of protein per meal... If a good portion of that comes from real food then it will go a long way towards filling you up. That's about 8oz of cooked lean steak per meal, or 10oz of chicken breast, etc... If you pound down an 8oz steak then you probably won't have as much room to eat an overabundance of good carbs. Perhaps for one or two meals you may, but 6 times a day? In fact for ectomorphs that simply don't have enough hunger or require massive calories to gain weight he advices for you to not eat clean so long as you get in your protein first. He also advices downing olive oil with protein shakes for extra calories.
The answer to his question is yes you can get some good clean gains in short order if you can put down enough food/protein and stimulate your muscles enough and be consistant about all of it. If you're an ectomorph it may be slower than a mesomorph, though most likely you'll be able to stay leaner doing it. Personally I can pack on muscle pretty quickly, it's keeping fat at bay that is the challenge. As I'm an open minded guy I am going to be giving DC's methods a try very soon and hope to see good results. Based on his theories which I belive to hold water, and on the success of many others I think it's a valid method.
At any rate if he is getting leaner while doing what he's doing I'd definately say he should keep it up. Who are we to tell him it's wrong if it's working? If he gets no muscle gain after a week or so then he should simply up his calories until the scale moves.
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