IMO all non MNK DPS should go in. Monks are better staying outside, blowing up the adds before the other DPS are finished in the belly and never lose GL. The OT (If you are lucky enough to have an OT with an IQ higher than 2 who actually grabs adds) takes less damage (so many healers just completely ignore the poison and end up having to spam heal the OT when they could just esuna once or twice and DPS instead) and the dps who were inside can jump straight onto cerb once they get shat out. Win/Win.

ABC is full retard anyway because you don't need a full party to do chains and you don't need a full party to do adds.