I think part of the confusion by the OP is that most versions of the DDP (except the Deluxe DDP) pretty much only cover two meals, not three, each day. Breakfast is often the cheapest meal of the day, so it's often cheaper to just pay out-of-pocket for breakfast, and stick to using your Counter Service and Table Service credits for lunch and dinner.
With all the food you get from lunches and dinners on the DDP, you might only be looking for a small breakfast. A kid's-portion of waffles/pancakes is fairly cheap. (I presume the Kid's breakfast meals are available at Contempo Cafe like they are at the Moderate and Value resort food courts)
Or, as already mentioned, use a Snack credit for a small breakfast item, such as a cinnamon roll, bagel, bowl of cereal, etc.
When using a Counter Service credit for breakfast, they will often allow you to substitute a baked good for one of the beverages. (Like if you have a refillable mug to use for coffee, you don't need that plus 2 more drinks) Ask the CM to see if it's OK.
-Rob