User blog comment:LegerPrime/Natsu surpasses Erza/@comment-153.91.238.254-20151009013541/@comment-24734624-20151010192056

Well, I'm guessing Hiro had input on Key to the Starry Skys cause Cobra looked just like like he did in the Grand Magic Games arc, and revels what happened to his eye. Also, the OS look how they did in the Tartaros arc.