My alt theory is the pyramids were started from the core first with the blocks and then built out from there. And the stone was right there beneath the pyramid

My alt theory is the pyramids were started from the core first with the blocks and then built out from there. And the stone was right there beneath the pyramid being carved out. But how did they get the blocks to the top? Using a crane system! At the apex there would be a lever balance and ropes would lever the stones into place.