Don:

Yours: "...sigh ... and then ? ..."

And then along came Jones...slow walking Jones...

Main causeways was required initially for off-loading materials and supplies...a given.
The next on the list was G2, G1, G3, the seven small pyramids, the ten mastaba south of G1, followed by two cemeteries (each containing a large mastaba of "major" significance) and finally...the Sphinx, temples, boat pits, wall surroundings and other minor details.

At least...that's the sequence I would chose.

Best.
Clive