Browsing this section of the book....the author examines the co regent position for the 2 Cartouches
If in my opinion....these cartouche sets in red ochre exist on Pyramids periphery and entrance ways.
This may indicate that in these reigns....the pyramid was entered and the graffiti added.
Vyse and company may have others** show them these cartouche sets....which Vyse then confidently adds to gunpowder
If the water erosion on the plateau and old kingdom granite repairs did not exist
I would be inclined towards Khufu build or complete a project going on for anyone's guess.
The high science of the chambers with wave guide ports and vast tunnel system going for miles in many directions
Under the plateau. ..that and the water intentionally engineered to be hydraulic function connected to the pyramid
With the understanding that the ancient westward Ur Nile was feeding into the plateau
The above is many Zodiac ages distant from both cartouches reigns....be they separate or co regent .