Owl Tarot
Quite possibly. Although I do like Gunther's idea that they, and their repositioning, are emblematic of a new Pentagrammaton that signifies the formula of The Woman Satisfied. The function of the Hierophant goes beyond Tiphareth in this Aeon to fulfill the 'Holy Covenant' that now allows the Abyss to be crossed.
I also like the idea, but I think those thoughts are actually harmonious with each other and work well together to illustrate the union of the Microcosm with the Macrocosm, one of the purposes of the Hierophant. He is a Holy Covenant in a sense, because he provides the means by which one can cross the Abyss from one Father (Chesed) to the Archetypal Father (Chokmah). Liber's 333 ΚΕΦΑΛΗ E' is pretty interesting to read since it reveals the harmonious nature of those two father figures.
Agreed. Although it's important to remember that in this aeon all manifestations of the Hierophant are ultimately forms of Hoor. In the scheme of initiation the aspirant is initially Osiris. See Liber AL I:49. This may be another reason why the Hierophant appears to be wearing a mask.
One more observation. Is the Hierophant casting a shadow? The window behind him would appear to be bright. The Hierophant appears to be blocking the light thereby creating a triangular shadow that forms part of the penta/hexagram.
Interstingly Set is the hidden (shadow) aspect of Horus and is symbolic of the HGA. Set (ShTh) can be spelt Shin-Tau = 700. This is also the numeric value of Paroketh, the veil before the Holy of Holies.
A nice idea that just apparently came to me, I like connecting the light behind him with the energy of Chokmah, which inspires him and causes his devotion (virtue associated with Chokmah), with the Macrocosmic aspect in which the Hierophant initiates. In order to achieve that, he uses structure to make concrete the abstact nature of what is above the Abyss via his "shadow" (using that interesting point), constucting those abstract archetypes into something solid, something which can get the "rush and out" energy of Chokmah and materialize it, connecting what is above with what is below, which isn't too far from the HGA function. In performing this task, he is indeed in a way a "Holy Covenant" which provides the means of crossing the Abyss.