TOMH is saying all these soaps we are talking about are made using the fully boiled process, which includes boiling the soap for several hours or days, and occasionally adding salt or salt water to remove impurities and glycerin from the soap from the soap.
I am saying that Castile is made that way, which we can't easily replicate. So even if you use 100% olive oil, there's still an argument that it's not very authentic. When people say that adding any other oil besides OO results in a *******ized version of Castile, they overlook that. If you don't replicate the process by which it's made, you get a pretty different product.
Aleppo and Nablus soaps on the other hand appear to be hot process soaps. That's something crafters do, so theoretically those soaps are easier to replicate if we can figure out all the details.
I think the long cook times could have something to do with the caustics they use, or used. Not sure.