Mainstream Archeology doesnt have all the answers when it comes to the pyramids / Ancient Egyptology....
A lot of it is guesswork. There are many objects that they still dont know how they were actually made! They can only guess....
Much like the 'Sabu disk'.....an extremely thin object made out of schist stone which is very fragile......even today, nobody could 'carve' that from that stone!!!
Also stone vases that are minutely symmetrical and believed to have been turned on some type of ancient lathe!
And of course the pyramids themselves!! Some believe these werent tombs. Why? Because in ancient Egyptian times, all tombs were decorated with paintings and hieroglyphics. The pyramids have none!
So, lots to delve into. Its not as simple as to just go along with Egyptian archeologists interpretations. Too many holes in the bucket to do so!