Here's the thing, and I can't believe I didn't think to post this earlier. These guys typically lose 10-15 lbs during the season and a lot of that is muscle. The offseason is the only time they have to increase their muscle mass...to "bulk" as it's called. You'll get your fat loss and conditioning in during training camp and then you'll lose weight again during the season, so if you want to be stronger and bigger, you have to do that right now, in about a 3 month window.
Now as you mentioned, most of these kids (and people in general) have NO CLUE about how to go about eating correctly and not only that, they don't really have access to good, healthy food. All they know is that it takes a TON of calories to add muscle to an already muscular 250 lb frame (we're talking over 5000 calories a day). These guys who are often "genetically gifted" know that thanks to their high metabolisms, they will easily shed excess fat during the preseason, but it also makes it harder to gain muscle when you're training, especially if you're doing any type of cardio. So what do they do? They simply eat as much as possible and whatever they can. To them, a whopper is as good as a steak and veggies (well a couple whoppers).
So it's not so much an issue of being lazy as it is being misinformed (the "see food diet" is an old school bodybuilderr thing). When they are professionals and can afford to have somebody preparing and planning not only their own specific workouts (rather than a cookie cutter approach) but also their meals, they will have a lot easier time managing weight and muscle gain.
sweatshirts are supposed to hide your gut
