I think I remember this...
It had to do with having multiple procs (namely weapon procs, spell procs like WoT or Pious Fury, and augs that proc). I seem to remember a post on the old pally boards saying that weapon procs fire off most of the time, followed by spell procs, and finally augs. But if you have 2 augs, 1 aug will proc more than the other, and it may be the case that having 2 augs that do the same thing means nothing since the same effect would be procing.
Can anyone help me out with this? I think this is what the response is trying to say.
Edit: Bingo.. Found a couple threads on the old boards that maybe help explain this...
http://pon.myfreebb.com/viewtopic.php?p ... rate#15811 - seems to back up my memory...
http://pon.myfreebb.com/viewtopic.php?p ... c+rate#155 - Scroll down a bit, there's a post with info on weapon procs vs. innate procs