User blog comment:LordLuminous/Silver being Deliora = Impossible? Theory/@comment-24066070-20140706124430

I think Gray is currently fighting Deliora and not some twisted father.

I am quite certain the original Silver was dead after Deliora's attack, since Gray, Ur and Lyon wouldn't leave the ruined town without confirming that all the other inhabitants were dead.

Unless Marde did to Silver what Madara did to Obito, the only motivation for such an act would be an experiment to revive E.N.D., but all of that is pretty farfetched.

As for Deliora learning Devil Slayer magic, he likely was looking for an Ice Slayer magic (due to the overwhelming advantage against Ice mages), but couldn't find an Ice Dragon or Dragon Lacrima to learn Ice Dragon Slayer Magic.

Considering God Slayer magic is apparently learned from a book, it may be the same for Devil Slayer magic. It could be he found a book about Ice Devil Slayer magic before he found a book about Ice God Slayer magic or that he simply preferred the former over the latter (It does give him a trump card against his fellow Guild Members, should he ever need it).

As for him referring to himself in third person, there are many more who do it for various reason. Juvia, Lord voldemort, etc etc ...