User blog comment:Miskos3/Fairy Tail Episode 250: Tartaros arc: Erza vs. Minerva, Review/@comment-24277053-20150912120428/@comment-2214433-20150912134157

That's actually a good point about the whole time thing, because if I recall, Jiemma became a master, along with the Sabertooth GMG team joining, during the 7 years that Tenrou team wasn't around. So I guess Jiemma wasn't a master yet during this flashback? ;x