JB: The lines misses the Corner of G2 and Lehner's not particularly convinced that the diagonal is significant. He just pointed it out as of possible interest.
SC: The line touches G2 terrace but not G2. This diagonal forms the basis of the Giza-Orion Blueprint.
JB: It's irrelevant anyway as it has nothing in common with Don's "Grid" which only manages two points of any significance and so fails as a convincing base for anything.
SC: The point is merely to demonstrate to you that the 'Lehner Line' (and all those points along it) would require a grid of some kind. Don might not have the grid dimensions nailed down but he is right in saying a grid would have been used.