BRD is a really good DPS when played purely for DPS and when they get a lot of procs but certainly not top dps. They are amazingly useful though so being top there is a possibility.

Assuming each player is at maximum skill, equal gear ratings and optimum uptime/rotations you basically have two lists.

Fights with adds SMN > MNK/DRG > BLM > BRD. Unless there's a ton of adds or enemies like something in T4, then the BLM can easily be top. But assuming something like T8 where it's just one dread sometimes, or T5 where its Twin + thing or 7 with lots of cleave dot potential SMN should be around the top unless they're kiting. If they do 4 stack though they can easily come back on top.

Pure tank n spank would be MNK > SMN/DRG > BRD/BLM But the difference between each group wouldn't be huge. MNK might be higher by like 10 dps, brd and blm should only be behind by like 10-40 dps depending on procs.

But again, player skill is a huge factor.