As mentioned before 2x MNK will do more damage than DRG+BRD, by a large margin actually because you have the higher skilled or more geared player use the normal FBB rotation replacing every DK with bootshine, and dropping Touch of Death. While the 2nd MNK reverts to the FBFB rotation which will sustain a minimal DPS loss if the rotation isn't messed up. The gain by doing this is larger than the gain that BRD gets from having a DRG, while both MNKs individually are doing more than the DRG as well.