"According to the general idea of scholars, the plan of the Great Pyramid was twice changed, and originally it was designed on a much smaller scale."
Similar claims have also been made of G2 and confirmed with G3 the latter of which I have argued was originally a tower core and later converted to a true pyramid.
Regardless, you quote Herodotus claiming the causeway was 60ft wide yet once again ignore the archeology which Hassan says:
"The upper, or western end of the causeway, from the edge of the plateau to where it passes the solar-boat, is clearly defined in its rock foundations, and a few blocks from the lower part of the southern wall still remain in place. Its total width at this part is about 9 m. The walls and passage all having nearly the same width."
So at the point leading from the mortuary temple past the boat pit we can archaeologically confirm it is only about 30ft wide, not 60. To reconcile against the words of Herodotus it is interesting that his figure is specifically twice what is actually is, but if he is correct then obviously this would not apply to the plateau side of the causeway.
As an aside, quoting Hassan:
The great limestone stela of Amenhotep II, which I discovered during our excavations around the Sphinx in 1936 (1), relates how Amenhotep, while still a Crown Prince, paid a visit to the Sphinx and Pyramids of Giza :
"He yoked the horses in Memphis, when he was still young, and stopped at the Sanctuary of Hor-em-akhet (the Sphinx). He spent a time there in going round it, looking at the beauty of the Sanctuary of Khufu and Khafra the revered. His heart longed to keep alive their names, and he put it in his heart". When the young prince at length succeeded to the throne : "Then His Majesty remembered the place where he had rejoiced himself in the neighbourhood of the Pyramids of Hor-em-akhet, and it was ordered to erect a sanctuary there, and to erect in it a stela of limestone, on which is inscribed his great name, Aa-kheperu-Ra, beloved of Hor-em-akhet, to whom is given life eternally ".