And yet YellowGhost is compatible with OrangeGhost and so we can say for a fact that, regardless of whatever pictures you are looking at, your animal is not a YellowGhost because when bred to an OrangeGhost you did not get visuals
While I have much respect for Greg he does occasionally make mistakes. The pattern in balls is widely variable and so a G1 from someone else's collection that had been out crossed could very likely have patterning different from the animals in Greg's collection.
So again, if you want to truly determine just what type of Hypo you have you are going to have to test by breeding. We can eliminate the most common lines of Hypo (Orange, Yellow, Peach, Butterscotch, Green, Bell, NERD, etc.) because they are all compatible. That leaves you with G1, G2 and GCR