User blog comment:SethHeartphilia/Whos stronger Erza or Mirajane/@comment-107.140.74.140-20150329044210/@comment-107.140.74.140-20150423233921

Also Mira can't use her full power against Erza. It's forbidden because they're guild mates but if Mira was kicked out like Laxus she would be able to draw her full power