Pat: If G1 was "always there", in other words, a constant on the horizon, could the AEs not have built against it? If G1 is a relic from a past time, could the AEs not have planned around it?
SC: I suppose that's possible. However, I would ask then that if the builder of G1 (the Great Pyramid) had a blank canvass at Giza (so to speak), why then did he not obtain for himself the highest, most prestigious ground in the centre of the plateau where G2 now stands? Why did the builder of G1 leave the Giza backdoor open, so to speak, by leaving the central high ground free for some other future king to come along and gazump him? And why not choose this central high ground which had its own natural causeway (the 'Gateway to Giza') which would have saved Khufu the bother and expense of building a massive artificial causeway deep into the northeast of the Nile Valley? And why was Khufu quarrying limestone blocks from either side of G2's causeway which, if the conventional building sequence is correct, would not have existed at the time and therefore Khufu surely would have quarried through the causeway of G2. Either G2 already existed or Khufu left that strip of rock in place because he was already aware of a bigger site plan.