User blog comment:LegerPrime/Natsu surpasses Erza/@comment-3290324-20151009035809/@comment-3290324-20151009173153

You just answered your on question my young friend, we haven't seen anything that Erza can do post-timeskip. I'm basing my opinion that Erza is stronger on the fact that she has been portrayed as such for 9 years now. Could things have changed over the timeskip? Possibly, but I doubt it. :D