My opinion in all honesty...
This guy is trying to gain weight; he is teaching himself to eat large amounts of food.
Who gives a flying F if he consumes carbs and fats at the same meal. I do agree with Lowery and Berardi and I think it is a good idea, BUT when I was first starting out every piece of food I so much as glanced at was put into my trap.
Again, I agree with Berardi and Lowery's principles most of the time, but sometimes I think they are taken to extremes, just let the kid eat so he can grow.
Start worrying about meal groupings more if excessive fat is being put on, until then, just eat, ALOT