We run DRG/NIN/BLM and me as SMN and I run Fires without a hitch. My DPS is not-so-awesome, so I usually assign myself to do mechanics like that since I have really good pattern recognition and raid awareness. It's all about knowing the strengths and weaknesses of your raidmates, I think, though of course in pugs that's really hard to guage. Either way, I can't recommend anyone other than SCH/SMN/BRD/WHM to do Fires...it's too big of a DPS loss on any other job to do them.