I don't think it does either.
One of the main reason for me is that some of the DPS have more instant big DPS numbers and then some DPS are more constant.
In addition to this, all the reducing aggro buff won't help also.
if the BLM has a FIRE 3 proc and it starts with this a mob, there's no chance that the tank will aggro in the the first seconds
That's my opinion of course