Sorry I think I took your question in a slightly different direction.
My personal take is that while he had several teachers most of his stuff wasn’t handed to him intact by another person. Obviously a lot of it was pulled from GD, Ancient Egypt/Greek, art, science, etc… at least one of his rituals were given to him by Aiwass etc…
I mean for his time he was well off, well educated, and traveled all over the world. If I remember correctly he saw most pantheons as different names for the same entities. And so my assumption is that he pulled his hand gestures from these statues that he went to go see and study in these far flung museums. A lot of these statutes were created by followers as a way to invoke/evoke/worship a certain aspect of these deities. He probably saw them as evidence/clues left by mystery cults/past masters for future practitioners or something similar. So he incorporated these stances as a way to invoke these entities/concepts etc… If we could sit down at the local pub with him for an evening I would wager to guess he would tie each one these into sources from each of Egyptian, Greek, Planetary (Uranus, Neptune, Venus, Jupiter/Saturn?????), etc…
But there’s the 2 cents of a practitioner who has only skimmed A.C.’s work. If you find out more, please report back, I’d love to hear about it.
-Eld