Enmity differs per ability, as well as through raw damage.
For instance, Jumps from dragoons generate less enmity (some even reduce it) despite the damage they do. And a Bard with Quelling Strikes can still be far higher than you in damage, despite suppressing enmity generation and being lower on the list.
Mostly it's true that if you're higher in the list, you're doing more damage than everyone else. But there's other factors in play. Curing, certain abilities and damage done (which isnt a flat convertion of damage = enmity, but more of an arch) count towards it.
You -can- probably say that if you're on top of the list, you're putting out the most damage, but it's not exactly hard science.
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[XI] Surivere of Valefor
[XIV] Sir Surian Bedivere of Behemoth
http://na.finalfantasyxiv.com/lodestone/character/2401553/