> I contend that the MC blanks could be sculpted on site to
> conform to those in evidence at Pantheon.
> Further that it would be the ideal method.
> The master craftsman on site for ornate delicate work do not
> have to fuss about the finish of the vast circular column
I contend you proceed from a false premise. The problem is your use of the word "blanks". On what basis are you claiming they were originally quarried as blanks that were prepped for shipping outside the country vs. finished columns that were used in buildings at the Mons Claudianus settlement but were later repurposed by Hadrian, et al.? What evidence is there to explain why Hadrian needed to go all the way to Egypt to quarry granite vs. getting it from local quarries in Italy? Why is it not possible that Hadrian got word that there were already a slew of ready-made columns for the taking in Egypt rather than going through the far greater labor and expense of quarrying and shaping granite from raw stone right there in Italy?
How can any of us ever know, when all we can do is think?