Then how come all you have to do is take PS-PA/G to get the same number that comes up under Point Differential?*Facepalm*
Point differential includes strength of offense as a measure of the overall strength of a team. Its offense minus defense.
You know what point differential uses to measure defense? Defensive rating.
But, by all means, continue to stand firm with that "All defensive statistics are meaningless, except for the one which supports my argument" thing you've got going on.