User blog comment:FairyRaven/Fairy Tail Chapter 328: Zodiac, Review and Commentary/@comment-112.205.41.120-20130421090106/@comment-7418318-20130421102738

Not necessarily.

We don't know the full prophecy about the dragon king festival. If what they remotely observed something that is written about in the prophecy, they might have deduced that those events protent the festival.

Or they might have some more knowledge about what's up with all the sevens.