Bill,Tom, I have read Galula and unless my memory is that bad he stated that there were 4! primary factors.
1-A cause
2-Weak government.
3-Terrain
4-Outside help.
That would indicate at least four COG's right from the start, but the author writes as if the other 3 do not exist. I thought that was rather mis-leading.
I definitely agree that the enemy fights at the strategic level and he is damn good at it.