Earlier in the thread someone posted that Microsoft has copyrighted the position of the buttons and sticks in their controller.
I wonder how Power A and Afterglow got away with the 360 setup in their PS3 controllers?
I believe this is just to keep in line with the GamePad, and it was setup that way on the Gamepad because of aesthetics and comfort. It does make much more sense on the GamePad than the Pro Pad.