First, I just can't see any possible way for a 30'square capstone of gold to be removed from a pyramid in Egypt, put on a ship and taken across the ocean to an island in Nova Scotia, and then lowered into a 30' cavity in the ground. At least not in the time period contemporary to DaVinci. The engineering, along with the workforce to make it happen would be, at the very least, immense. Hard to hide.
Second, where was it prior to Davinci and the Freemasons/Templars? Conservatively, no one in recorded history within 2000 years of Davinci's lifetime or the existence of the Templars had ever seen the GP topped with a capstone. If it was hidden so well then, why move it? Thanks.