DRG + BRD do less overall damage than BLM + SMN. BRD are the lowest DPS, even with a DRG boosting them, and especially if they're singing (which I always assume you've brought them to sing, otherwise get another DRG or a MNK. Ballad is a DPS decrease for them, and if he's singing Foe's you can't forget he's boosting YOU, so there's even more of a difference).
A DRG doing things right will be at the top of the aggro list; we have one aggro-dump skill that you do not use unless you absolutely have to, so we only gain aggro, never lose it.
T4, both our DRG will be fighting over tanking the first Knight in phase 2 as our PLD tries to hold aggro on the Soldier (Keen Flurry + Bloodbath works really well here), and on almost every boss fight, I'll be #2 or #3 on the aggro list (depending if its a 4-man or 8-man; right behind the tanks); I look up at the meters on Titan EX occasionally and see me really close to the tanks a lot. And if the DRG is more geared than the tank...that first burst rotation the DRG does can very easily steal aggro if the tank can't generate enough aggro in such a short period of time.
