User blog comment:FairyRaven/Fairy Tail Chapter 426: Black Heart, Review and Commentary/@comment-76.121.234.236-20150402033706/@comment-7418318-20150402083209

Wendy's personality didn't change at all, so there's not really any point.

And with Gray we have barely any information at this point. And even if we had more than a handfull of frames of him, we still wouldn't know if he's corrupted, possessed or pretending.

Lucy and Natsu should be possible though.