Reading the content of your posts, I had inferred that you find orthodox opinion less than satisfying, at least with respect to djed pillars.
I am in agreement with you that the use of myth to communicate the sense one has made of the world inevitably leads to symbolism and no-one takes the symbolism literally; moreover, the symbolism helps one to deduce the underlying abstract concept.
To elaborate, you mentioned Osiris' body being chopped into 14 pieces. This is evidence of AEs using myth to explain the lunar cycle. Two milennia ago, Plutarch explained it thus:
"The Egyptians have a legend that the end of Osiris's life came on the seventeenth of the month, on which day it is quite evident to the eye that the period of the full moon is over. Because of this the Pythagoreans call this day "the Barrier," and utterly abominate this number. For the number seventeen, coming in between the square sixteen and the oblong rectangle eighteen, which, as it happens, are the only plane figures that have their perimeters equal their areas, bars them off from each other and disjoins them, and breaks up the ratio of eight to eight and an eighth by its division into unequal intervals.
Some say that the years of Osiris' life, others that the years of his reign, were twenty-eight; for that is the number of the moon's illuminations, and in that number of days does she complete her cycle. The wood which they cut on the occasions called the "burials of Osiris" they fashion into a crescent-shaped coffer because of the fact that the moon, when it comes near the sun, becomes crescent-shaped and disappears from our sight. The dismemberment of Osiris into fourteen parts they refer allegorically to the days of the waning of that satellite from the time of the full moon to the new moon." (trans. F Cole Babbitt, Isis and Osiris, 245-249)
Here we see the motion of a heavenly object being communicated via myth, with the moon anthropomorphised as the deity Osiris whose parts are symbolically scattered, only to be gathered and magically made whole again by Isis.
On the main ceiling of the Dendera temple are inscriptions and reliefs that leave no doubt about the lunar cycle meaning of this myth. In one panel, an eye, installed in a disk, is transported in a boat. The eye, we know, was a symbol of the sun or moon. Thoth, the ibis-headed scribe god of wisdom and knowledge, pilots the barge. Thoth was closely associated with the moon and counted the days and seasons. The text for this panel refers to the period after full moon, and 14 gods accompany the eye in the disk.
Next to the portrayal of the waning moon, another carved panel represents the 14 days of the waxing moon. A staircase with 14 steps, a god on each, leads up to the same eye and disk, and hieroglyphics verify the god's association with days of the growing moon. Osiris, it is written, is "luminous" as the god of the moon.
Finally, a third panel depicts Osiris in a boat with Isis and her sister Nephthys. Goddesses of the four cardinal directions support the sign of heaven, on which the boat floats, and the inscription states: 'Osiris is the moon.'
You can see the panel depicting the waxing moon here:
Interestingly, Djedefre was the first pharaoh to incorporate Ra in his cartouche name and many mainstream Egyptologists dispute the idea that Djedefre built a pyramid; they argue it was, in fact, a temple to the Sun so some of your ideas are not too discordant with orthodox ideas about the structure. Where you differ, I imagine, is in your belief about its function.
Might I ask you earnestly why you think the djed pillar is not still in situ at Abu Roash? Objects of considerable size like obelisks, to which you compared the djed pillars, have survived abundantly. This is why I asked for your opinion on what material you suspect was used to construct the djed pillar.
Also, The reason I included Nefirirkare and Unas is because they are also Old Kingdom pyramids which seem to line up with the three sites you linked in your image; however, the archaeology suggests these two structures, built during the same period of antiquity, are most definitely tombs.