User blog comment:IamJakuhoRaikoben/Chapter 515: I Am You... You Are Me, Review./@comment-117.223.154.228-20161220220753/@comment-25111584-20161223101554

All the plotholes are related to Acnologia. We know jackshit about Acnologia. True, there might be nothing significant to learn about him, but I can wait until that is at least confirmed. /o/ And, just to be clear (not that anybody would be confused anyway), filling up the plotholes that are evident here by explaining that stuff in Acnologia's plotline (if there actually is one, of course) is not retconning, just foreshadowing... although Mashima stinks at that, unfortunately. .-.

The only plothole regarding Acnologia that I'm concerned about atm is his continued absence, but I doubt Mashima will even acknowledge it, let alone address it. >.>