Yes, true... but ashes. To expect that these bones, teeth and fragments are easily identifiable and in the same location as they started seems wrong to me and my non expert mind.
Forgive me but I don’t actually remember if fire department was called to extinguish the fire? If so, I’d say the water would greatly displace some fragments and bones. I just don’t get how they can tell right away. I won’t go searching for pics of the type, can’t handle that. But my impression was that the bones do not stay connected to each other.