It wasn't as though the pyramid builders had unlimited time in which to design, prepare, transport, build and consecrate each edifice. So, I have never been convinced of the decision of Djedefre to "build a pyramid" at Abu Roash. The fact that there is no pyramid there (another unfinished one??) and is actually the opposite style of construction, gives me major pause on this premise.
IF the Dynasty 4 chronology is correct, the building of the Pyramid of Khafre should have been the perogative of Djedefre, being the supposed primogenitor and rightful successor to Khufu. It really defies belief to accept that a person in his position would forgo his royal duty and virtually snub his father by not continuing on with the building plan - if there ever was such a plan.
However, the addition of the name Re to his title (he being the first) and those immediate family members (Khafre, Menkaure, Baufre?) also adopting a similar addition to their titles may be of significance and an abandonment of a stellar worship in favor of a solar one.
The cartouche of Djedefre on a roofing block of one of the Khufu Pyramid boat pits does not necessarily link him to Khufu as that block may have been recycled.
Nonetheless, I am favoring a central Giza Plan rather than dying pharaohs building tombs in conspicuous places. The discovery of statues of Djedefre, Khafre and Menkaure, but nothing of Khufu also gives rise to some doubt as to the position of Khufu in the timeline.
The first reason is the particular alignment of the causeways. The second reason is the placement of three satellite pyramids at the edges of the Khufu Pyramid and also the Menkaure Pyramid but no such triad of pyramids adjacent to Khafre. I know the explanation is that these were tombs for wives but that may have been a secondary reason.
The Khufu mastaba fields are to me, all post pyramid, temples, causeways. Some may contain remains from earlier times and reinterred.
It almost appears as though Khufu's satellite pyramids were built without any recognition of his Mortuary Temple ever being there and the excavation of the eastern boat pit being excavated without knowledge that it was practically impeding the movement along the causeway unless it was always meant to be below ground level with no marker above.
I'm still trying to calculate how so much detritus and building material could have been still in place before the 1938 excavation. And also the composition of it. The conglomeration on the northern side covers the causeway. Is it the causeway?
No conclusions yet. More research needed.