No such thing as natural shadow tendrils. You cant naturally radiate shadow tendrils, because shadow tendrils dont exist without magic. Dragons are born with their elements, but they require magical power to use them.that can just be his natural shadow tendrils leaving a trail since they are of a misty-like substance, and again, we see him not covered in shadows in the anime, and Weisslogia was not even a ball of light in the anime too, besides he naturally radiates light without using any magic as he is the white dragon. So? Other dragons destroyed the faces with wind pressure too, not just Grandeeney. They are natural as he is the shadow dragon, just as Atlas’ Fire body is just as it is, his body Of fire, natural and magic are relative to each other, like no different. They are born with their elements, not learned iirc.
your links are broken
Atlas Flame has a body. He has legs wings, and a tail. He also has solid mass, most of the time, as Natsu is able to ride him. He's just using magic to turn his body into fire, not unlike Juvia with her water body. When he died and became the eternal flame, that's when he became a giant bonfire until Wendy's milky way gave him form again. But at that point he was just a memory.
In any vase the parent, dragons are clearly still able to use magic. Their very lives are tied to the dragon soul technique. If it runs out, they dissipate and die. It didnt untill well after face was destroyed.