User blog comment:FairyRaven/Fairy Tail Chapter 357: The Nine Demon Gates, Review and Commentary/@comment-16214733-20131025094546/@comment-7418318-20131026222118

First you say that it doesn't make sense that Tartaros would attack CS only to follow up with saying they should attack CS?

I don't get you at all.

I never said Tartaros would attack CS because they are pissed off about them wiping out Dark Guilds. But CS has shown themselfs to be an enemy of ALL Dark Guilds and since Tartaros is a Dark Guild, that makes them enemies as well. Whether Tartros will wair for CS to make it's move or hunt them down actively remains to be seen, but the two guild surely consider each other mortal enemies.

And Tartaros didn't wipe out the lesser Dark Guilds because of any cleanup or contest. That their affiliated guild ended up mostly wiped out was just the side-effect of Kyouka's magic... mostly because I'm sure a few mages from the lesser guilds must have survived the magic and been "promoted" into the ranks of Tartaros itself.