[Pescador]

This discussion has been done to death.

Tons of people tested this in classic by:

1. equipping wurmslayer in main hand
2. equipping jade mace in offhand
3. logging / observing the slash and crush attempts

Your crush attempts were not lined up with your slash attempts. The offhand wouldn't always fire faster than the mainhand because your dual weild skill determines if you even swing in the first place, but frequently you could see the jade mace swing twice before wurmslayer swings once (I'm not talking double attacks - I mean independent swings).

I played a bard on live so it was even easier for me to test since we don't get double attack. Equip a slow slashing weapon in mainhand, fast crushing weapon in offhand, and after a while it becomes very obvious that the offhand isn't "linked" to the mainhand in any way. The offhand is only linked to your dual weild skill, period.