You :
What translation of the Pyramid Texts are you using?
Faulkner lines 181 to 192. But I have looked at Sethe and Allen which are basically similar.
They all translate the text as Little or Lessor Ennead.
You :
'Ennead' is a term that by its origin means 'group of nine' and is depicted accordingly.
Yes, I think the hieroglyth was created to describe the nine great gods of On.
Over time the verbal word was used to describe other groupings of gods. In this case it was 11 regional gods. There were other groupings in the Middle Kingdom.
You:
the Little Ennead is a weak basis for the hypothesis about the Old Kingdom monuments, since its very existence during this period is doubtful.
I think that your comment comes from Griffiths. He noted that the two Enneads being described as Great and Mighty, not always Great and Lesser. Yes, the Ennead of regional gods were less important than the Ennead of On, but they could still be mighty !
Griffiths wrote : “There is other evidence for a belief in the existence of non-Helio-politan Enneads in the Old Kingdom”
In PT line 1546, the risen King sacrificed the Bull and shared out the pieces of it to the gods, presumably to the two Enneads who approved his ascendance to the stars. The shares were first to the gods, who are clearly from the Great Ennead and then to 11 other gods who made up another Ennead :
Hnt-irty, Kherty, Neith, Selket, Sakhmet the Great, Hapy, Imsety, Duamutef, Kebhsenuf, Anubis, Osiris
You recall on the ceiling of Seti 1 there were two sets of Enneads, nine on the right and 11 on the left. I tried to look closely at the nine gods and was able to identify several gods who may be members of the Great Ennead at Seti’s time.
Tefenut with the lions head, Anubis with the jackals head, Amon-Re with the falcons head, Osiris with the two feathers, the last god possibly Hathor holding the sistrum.
For the 11 gods on the left side, I was able to identify Thoth - but few others.