Soft cartilage, connective tissue, blood, the gritty marrow of knuckle joints can all be consumed, and have the perfect balance of minerals needed for building strong bones and healthy tissues...
Another important point is the calcium intake requirements for people eating processed cooked diets will generally be much higher than those eating a holistic Raw Paleo diet. Anti-nutrients in grains, refined carbs, and numerous other insidious factors of modern life leach minerals out of the bones and prevent the optimal assimilation of minerals into the bodies tissue, so more calcium is needed for people living in the modern industrial agricultural medical matrix, to maintain bone density, than those living on the Raw.