User blog comment:Yuri Rozu/Fairy Tail Chapter 497 The Winter Mage?/@comment-62.113.20.7-20160812174640

Well, we haven't seen Gray go all-out after the time-skip, so I guess he has some hidden power. As for the Irene and Erza connection, I've been thinking lately that Erza is a special enchantment that Irene created, but there must be more to it.