I know this is old, but has anyone actually looked at the Japanese version of the game? I feel like there can be some upgrades to be had there.
And with the fact the Great Ones are blatantly called superior/high-ranking beings and linked to transcendence and a blatant higher-dimensional statement along with terms such as "super-dimensional" they should at the very least be given higher-dimensional existence.
A lower-dimensional being can't even touch them let alone see them.
Also, co-op is literally canon and are referred to as other worlds directly also called dimensions. Great Ones can not only exist throughout these many dimensions/worlds of the various Hunters, but also transcend that and exist on higher planes (also called dimensions in Japanese).
I'll probably be criticized for the bump after so long but I feel like I don't really like the current state of this verse on the wiki. Also, the downgrade that happened for A Call Beyond differs in japanese how that "lofty plane of darkness" is actually "a super/higher dimensional void/darkness/rift" and that instead of being able to reach the homes of the Great Ones, they harnessed the small explosion of a star. The Star's size isn't mentioned in the Japanese, but rather the size of the explosion they can harness from it.
Amygdala is a true Great One. We don't fight a lesser Amygdala, at least the game doesn't think so, and that Amygdala can be found just before the Loft above and is supposed to be encountered around the time you get to the Lecture Hall. If Maria and the Orphan can get a likely 5-A rating, then Amygdala should as well.