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Modern dissenting hypotheses

Rainer Stadelmann, former director of the German Archaeological Institute in Cairo, examined the distinct iconography of the nemes (headdress) and the now-detached beard of the Sphinx and concluded the style is more indicative of the pharaoh Khufu (2589–2566 BC), known to the Greeks as Cheops, builder of the Great Pyramid of Giza and Khafre's father. He supports this by suggesting Khafre's Causeway was built to conform to a pre-existing structure, which, he concludes, given its location, could only have been the Sphinx.

In 2004, Vassil Dobrev of the Institut Français d'Archéologie Orientale in Cairo announced he had uncovered new evidence that the Great Sphinx may have been the work of the little-known pharaoh Djedefre (2528–2520 BC), Khafre's half brother and a son of Khufu. Dobrev suggests Djedefre built the Sphinx in the image of his father Khufu, identifying him with the sun god Ra in order to restore respect for their dynasty. Dobrev also says that the causeway connecting Khafre's pyramid to the temples was built around the Sphinx, suggesting it was already in existence at the time. Egyptologist Nigel Strudwick responded to Dobrev saying that: "It is not implausible. But I would need more explanation, such as why he thinks the pyramid at Abu Roash is a sun temple, something I'm sceptical about. I have never heard anyone suggest that the name in the graffiti at Zawiyet el-Aryan mentions Djedefre. I remain more convinced by the traditional argument of it being Khafre or the more recent theory of it being Khufu."

Geologist Colin Reader suggests that water runoff from the Giza plateau is responsible for the differential erosion on the walls of the sphinx enclosure. Because the hydrological characteristics of the area were significantly changed by the quarries, he contends this suggests that the sphinx likely predated the quarries (and thus, the pyramids). He points towards the larger cyclopean stones in part of the Sphinx Temple, as well as the causeway alignment with the pyramids and the break in the quarries, as evidence that the pyramids took the alignment with some pre-existing structure, such as the sphinx, into consideration when they were constructed, and that the sphinx temple was built in two distinct phases. He contends that such erosion could have occurred relatively rapidly and suggests that the sphinx was no more than a few centuries older than present archaeology would suggest, suggesting a late Predynastic or Early Dynastic origin, when Ancient Egyptians already were known to be capable of sophisticated masonry.