Raw meat contains an excellent array of fat including essential fatty acids. Some fats can become cancer-causing when cooked. The pancreas will never shut down because it does a lot more than provide digestive enzymes. The pancreas also store Beta cells which are important part of the immune system. Infection can be caused by a variety of ways other than diet.
Illness can occur due to stress of the body, injury, etc.
I would imagine that it is bones or bonemeal that is used to supplement kibble diets. Why not use the pure ingredient to acheive maximum quality of nutrients. Bones also provide essential fatty acids, amino acids, glucosamine, minerals including trace minerals and other essential nutrients. Bones also help to keep the teeth clean due to the grinding action that occurs when a dog or cat chews a bone. Therefore, it is well covered.