User blog comment:MarineroLelouch/Power Ranking and Classes./@comment-3290324-20140211014255/@comment-7418318-20140211103604

Mirajane managed to stay alive in a prolonged fight with a Dragon, which should count for something too.

Sure she had Wendy alongside her, but it's still more than any other none-Dragon Slayer managed. All the other mages were grouped with their entire guilds after all.