Those tricky Egyptians had always planned to drop those granite plugs on anyone interfering with the ascending passageway (reference trial site which has just been noted). The entire passageway was narrowed at the beginning so both granite and limestone were held back (you mention it but don't illustrate it). More likely everything was put in place during construction. The limestone was supposed to make the entrance to the ascending invisible but of course at that stage every architect knew that the average tomb robber was smarter than Re ... and he was.

I don't see how the limestone plug could have possibly been dislodged if it hadn't have been interfered with first or do we accept that it gradually deteriorated and slipped out by itself.



"The Ascending passage from the entrance passage is somewhat troublesome to measure, owing to the large plugs of granite that fill some 15 feet of its lower part; and also to the irregular way in which much of its floor is broken up"

My main man Petrie.