User blog comment:Panemorfos/Strongest Fairy Tail characters up to chapter 470/@comment-26537859-20160131054702/@comment-71.50.115.253-20160131061138

Well I don't know, I mean Lucy was very low on magic power and because of that, he couldn't get the chance to fully display what he's made of since she was almost at 0 which when she was his gate would end up being closed which was why he left it to the guild to take care of him.