That's why I put in the Ego thing. Gil has such a strong Ego he was able to overcome the grief and negative emotions spawned from Enkidu's death, instead using his words as additional motivation for the remainder of his life.
Its more of an embodiment of that, the effects of his death on Gil, since that is a major part of his importance in the Epic of Gilgamesh. I find that prime material to make into a Noble Phantasm.