User blog comment:FairyRaven/Fairy Tail Chapter 368: The Third Seal, Review and Commentary/@comment-24066070-20140127014759/@comment-7418318-20140127091218

How can you say that a Lacrima that's strong enough to vaporize one building is equal to Etherion that can wipe out at the very least an entire city? That's like comparing C4 with a nuclear bomb.

Zero might be a destruction junkie without any inhibitions but he's not stupid. Of all the present mages Jellal is clearly the greatest threat, so it's natural to go after him first. On top of that he might still harbour hopes of keeping the others under his command, which would just leave Meredy as an alternate target.