User blog comment:FairyRaven/Fairy Tail Chapter 407: All for My Demise, Review and Commentary/@comment-86.70.179.180-20141101135309/@comment-7418318-20141101213116

I wouldn't be so sure.

Lucy wasn't part of the guild when the events "happened" that Mest put into everyone's minds, so she would have had the least defenses against his manipulation. Hell he could have just told her all the stuff and she wouldn't have had any way to know it was a lie (other than asking the other FT members anyway), even without any magic, since she wasn't around at the time of the last exam. And with him "being" Mystogans disciple, him not being in the guild often isn't all that suspicious either, considering how often Mystogan visited the guild.