User blog comment:IamJakuhoRaikoben/Chapter 386: Galaxia Blade, Review./@comment-24467372-20140530205114/@comment-24467372-20140531014729

That's a wack theory for me.

Jellal fighting Mard is even more wack but still :D

Mard was just foreshadowed. He is being kept down because he is simply too strong.

E.N.D possessing him is just one possible theory. E.N.D is in the same situation as Mard. If one of them gets freed,the other does too.

So I say that all the fodder demons will go down before E.N.D and Mard appear once again.

It won't be Jellal fighting him most likely. Laxus/Erza might be a more possible choice but Jellal is still on the table.

Saying the second strongest demon will be out for the count while we haven't seen his full power and demon form.. That's crazy :D