You made a mention of Imhotep in another topic, and considering he was the architect of Djoser's pyramids, how can it be that Khufu's pyramid was so much more? And yet by all accounts, that was the pinnacle of achievement for inclusions in pyramids. Sure, masonry might have been a little better in later pyramids, but that is not to say that we are certain about Khufu being the pyramid's builder...only that he is identified as the one who left his mark upon it.
So many examples exist where particular rulers destroyed references to older rulers, and not limited to defacing texts carved onto buildings and tombs. To erase history and claim something as one's own is easy enough, but to have a structure that stands out as being quite unique when compared to other similar structures can only make one wonder where something should appear historically instead of where it is claimed to appear. Khufu's and Khafre's pyramids are quite unusual, but because Menkaure's pyramid is also upon the Giza Plateau can only make us wonder whether the three were actually built in the same time period, or if some other time period offers up a better explanation for when pyramids were actually built, and when they were copied. The feature above the entrance to Khufu's Pyramid possibly identifies that another time period is responsible for the Giza pyramids, and all because of the two mounds AND the pyramid within that feature. While some speculate that the three pyramids mimic the belt stars of Orion, the entrance-feature gives a glimpse that some other identity is being expressed, and I think it alludes more to two primary sources of existence that enable an offspring to come into existence.
Djoser had four pyramids built, as we are lead to believe, and yet each one of them was different to the other. If Imhotep truly was the architect of all of them, then what was he trying to do? Advance the style of the mastaba? Perfect a form? Mimic something that already existed?
In my own study of the Great Pyramid, I found the size of it to align to a flattened plan of the cosmos, with the floor of the Queen Chamber referencing Sirius in its lowest position according to Earth's Axial Precession, and the half height of the pyramid referencing Sirius at its highest position, the two moments some 12,500 years apart, being 11,875BCE and 627CE. How would the AEs have known this, let alone incorporate it into the architecture of the pyramid?
As much as I can determine, no other pyramids exhibit this.