User blog comment:FairyRaven/Fairy Tail Chapter 357: The Nine Demon Gates, Review and Commentary/@comment-202.156.8.15-20131027092305/@comment-7418318-20131027145146

If she has pity or compassion for Humans, I hope it will only extend so far as to give them a quick and painless death, rather than making them suffer.

We had so many former enemies switch sides in the story already. And if it really HAS to be Silver, Oracion Seis and Minerva would be much better candidates for defection.