I think you're on something... um, make that on TO something... oh, either way or both, lol. Maybe the flashing lights are just the spaceships following union rules on safely backing up. Ya know, this could make the next million seller on the NYT reading list!
The fact that some pyramids were not completed, and that the construction program, as a whole, was terminated, can readily be understood now. Obviously Pharaoh was finally forced to close the Egyptian borders to little men, aka. illegal aliens, who left their home planet in search of a better life on Earth.