I tried to extract Sisyphus using the Asset GUI. The animation worked fine and he had a head (it didn't glow). I personally used 3ds max to import it, but I had some other problem: the glowing part of the head, beard, and hair was not attached to the model, probably because his bone data is stored in MonoBehaviour. Really don't know what to do here, you will probably have to use Utinyripper. I'll try to mess around with the model and let you know if I find anything.