Thats the thing, you've not provided any "hard facts". The wowhead bit you linked had no math, and your own math doesnt add up for reasons I already stated.
See, something you're missing was that during TBC, Vanilla, and I believe WotLK as well, a weapons base attack speed mattered a lot. Do not get this confused with attack speed modified by haste, since that is something else entirely. I am talking the base attack speed. Why did this matter? Because a slow weapon had a higher maximum damage and minimum damage even if the DPS might be comparable with as slower weapon, what matters here is what the max and min was. What this meant was, that abilities hit harder on slower weapons even if they had the same DPS as a faster weapon. Its why for instance arcanite reaper was so popular: it was slower than the average 3.6.