That has to be a shoulder blade the way you describe. Based on what I see, it probably went through the shoulder blade and snapped off as it was embedded. At 63 lbs you would think you get more penetration.

That deer could be dead. I saw it happen to someone with the same circumstance and penetration. We found the deer a week later with the arrow embedded in the shoulder blade and only 2-3 inches penetration for there was enough to bleed it to death internally. If you can get a decent tracking dog.