User blog comment:B214/Chapter 482 review/@comment-4933386-20160418125104/@comment-7418318-20160418142736

Technically we don't know if Erza defeated Kyouka.

Sure Kyouka was down on the ground, but we don't know if she would have gotten back up again if she hadn't been stabbed by Minerva and killed by her connection with Face.

Erza on the other hand didn't look like she would get up any time soon.

Of course that was before the last time-skip, so Erza is now likely even stronger.