1D4 9pts(outer) are 3 points in each of 3 rows
I see. My point is that the 5DIII has a cross-type AF point above the upper-most, center, selectable AF point in 9pt mode (and one below the lower-most, center, selectable AF point). Why not use these in the 9pt mode instead of ones closer to the center? You'd get more AF spread... and like I said, photographers are typically talking about more AF point spread, not less.
Enabling those (to create a diamond like spread of selectable AF points) gets you one step closer to an area of the frame that has no AF points at all. I don't really understand decisions such as these. Maybe I'm missing something.
Either way, customizability would solve issues like this in one gigantic sweep.