User blog comment:FairyRaven/Fairy Tail Chapter 354: Ephialtes, Review and Commentary/@comment-49.144.230.183-20131004225548/@comment-180.242.4.161-20131005100226

nah, Grimoire Heart clearly the strongest dark guild, because tartaros (the strongest, stronger than GH) haven't been revealed into the earth (they spent most of their time hiding underworld) so nobody in the earth knew a bit about tartars, thus until tartaros appeared (this time they made a move) , GH was considered the strongest

this make a sense? well i suppose