Lets get one thing correct, Khufu was involved on Giza, otherwise why are all his officials tombs situated there, and yes, I have read Reisner's accounts of excavations in the western cementary.
The issue is how genuine is the paint, something you are at pains to blur endlessly. You talk as if you take this at face value, so who has blinkers on.
The truth is, you don't wany anybody to challenge your cafrefuuly constructed Khufu's tomb only scenario.
What are you and your SCA friends hiding, and why are other relevant questions.