This Thing You Call Aggro.

[Treesh]

I have to object to that statement.  CC is taking a mob out of the picture so you can basically ignore it until it's his turn to die.  If you're off-tanking it, you're not ignoring it.
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I agree with this for most cases. Of course, I can think of a good exception off the top of my head. ;)

The first time I went into BRD, we had Gnolack, Galreth, Sharanna, Mirajj, and Aleri. That's right. Three hard shells. Definitely not Aleri's normal group composition. :D We got to the elementals and each hard shell took their own target to spread out the elementals so the AoE pulses wouldn't stack on top of each other and really blast people. I would consider that a form of crowd control, but not a hunter just off-tanking something. The difference (in my mind anyway) is that by doing it this way, we seriously reduced the amount of damage the entire group took. Instead of all three of my hardshells each getting pummeled by three AoEs stacking, which would take a ton of healing, it was three hardshells each just getting hit by one apiece. Massive reduction in damage taken for the entire group and since the pally healed herself, that made it feel like crowd control to the priest. ;)

This is of course a different definition than what you described (damage reduction for the entire group so no increase in healing for the priest vs no damage lost on the primary target), but I mainly responded just so I could mention the time when Aleri was the squishiest member in the group. :D So very rare in her case.