Question about FCOB raid setups

[Ooshima]

For T13 you'll want some ballad either way.

Nope, if no one dies, team doesn't eat too much unnecessary dmg and your WHM doesn't suck in MP management, and your DPS is good enough to push Phase 2 (depends on how you do it - some team let the boss hover around 53% and kill the 3rd add and immediately phase the boss, some team just #yolo and whack as hard as they can, the 3rd add spawns during DB and they kill there after), technically you don't need any Paeon as long as you have a NIN, and you don't need ballad.