Coil groups don't want dragoons?

[Ephier]

MNK offers dragon kick which helps reduce damage from certain magic attacks so more likely to bring a mnk than a drg, so that leaves one spot, which is more likely to go to NIN than drg, since although drg offers the BRD a 10% piercing buff, the NIN offers the Mnk goad which means the BRD won't have to paeon as often. NIN has less positional requirements than drg and also can offer some magic damage with ninjutsu to help with those magic mechanics.

Bard has to put up paeon just as much because NIN burns TP at the same rate MNKs do. I do not know where this argument came from (it is not just you saying it) but it needs to die in a fire some where over yonder.

Also NIN magic DMG from mudra is trivial in the grand scheme of the entire fight.