Listen carefully to the Intro. it speaks of the really bad stuff, Trow myrks, etc. and then as if to tell us what saves us "The arabesks also show A hero (Not THE Hero a hero as in a person) being born under the tail of a flaming comet. And (as in the conjunction pertaining that this part of the sentence is directly connected to the previuos part) I now realise who is honored in this shrine, Connacht the Wolf the greatest hero in all legend."
The way it is spoken, the grammer etc. suggest that the Journeyman speaks of a person, a heroic person, a hero. Not a spirit which in any game of Myth has never been mentioned directly. It states in Myth II epilogue "The hero of every age is different" And that suggest that the there is no hero spirit. In the Myth III intro it suggest that a person who is born under the tail of the comet becomes a being of immense power, but not that a hero spirit is born and then inhabits a powerful military leader.
-zeph