I agree here, the only shaft that works out it the KC South shaft and it makes sense for this to target the central star which is also the brightest of the three. Bauval resorted to the pyramid apex altitude above sea level to match the star magnitude. This does work out but the size of G3 is a problem. As I have pointed out the altitude of the Greek mountain that correlates to G3 in my theory explains perfectly the magnitude of Mintaka.