Yeah, the thing is, parses like that are terrible for actually judging the power of weapons or tomes or w/e because parses, especially exp parses can be hugely impacted by skill, attentiveness, and lag.
I cant tell you how many times I have known two players with nearly identical gear, tomes, etc, and one of the will consistently, significantly, outparse the other. You would think SOD mechanics are simple enough / dont require much skill as to not see that much difference, but it really exists, and its really common actually.
Just looking at rogues, in an exp setting, there are a ton of ways one could play to be way more efficient and outparse the other. First, just how quickly you get in meele range and turn auto attack on. If one rogue takes .5s to switch to each new target, and another takes 2s to switch to each new target, in an exp group that will amount to a lot of DPS loss. Then you have similar issues with backstab. If one rogue engages immediately on mob, they might get an additional backstab off that the other doesn't, and that can be a big chunk of extra damage. Then you have clickies and buffs. Is everyone maintaining optimal DPS buffs and using DPS clickies on cooldown/at appropriate times? There are other factors that can play a role, but I think you see my point that that sort of parse just isn't a decent way to judge weapons/tomes/etc.
If you wan't to know the impact of weapons, you need to parse on your character, on the same mob, doing everything you can as similarly as possible.