User blog comment:Miskos3/Fairy Tail Chapter 367: Jellal vs. Oracion Seis, Review/@comment-77.195.192.249-20140117105023/@comment-7418318-20140117105854

I doubt Eflman has the necessary power to destroy the guild with so many members present.

Most likely he was sent there as a message and a blow to FTs morale, rather than Tartarus expecting him to really accomplish anything.

Think about it: First they have to hurt and subdue Elfman which by itself is a daunting task. And then, instead of going in to free prisoners who want to be free, they have to assume that their other captured friends are also going to fight them with all they have.