If you're taking a DRK or PLD, it's better to have the WAR pull in Defiance with Unchained and then swap out to Deliverance and let the other tank take over. This allows the PLD or DRK to turn off grit or shield oath since they never have to use their enmity combos afterwards. It's a DPS increase if your concern is maximizing tank DPS and you're not taking 2 WAR.