GC: "G2 is positioned midway beteeen the mid points of G1 and G3 On the "Giza Diagonal" line. If G2 was 'moved' it would no longer be midway between G1 and G3. Perhaps this symmetry was deemed to be important."
Hi Graham,
The symmetry is a consequence of the series of squares that define the overall layout.
The intersection of the 'Giza diagonal' with the SE / NW diagonal through the centre of G2, lies midway between the centre of the north side of G3 and the centre of the south side of G1, but any enlargement of the pyramid need not affect the position of the SE / NW diagonal through the centre of G2 - this diagonal still remains halfway between G1 and G2.
CT