User blog comment:LordLuminous/Silver being Deliora = Impossible? Theory/@comment-4700320-20140714123100/@comment-7418318-20140714151009

I didn't think of that possibility before, but it would be intersting.

Imagine if Silver somehow survived the destruction of his hometown, learned Demon Slaying Magic to avenge his family (probably thinking that Gray also died) and then attacked Tartaros. He failed, but still managed to kill one of the Nine Demon Gates, with his kind of magic making sure that it couldn't be resurrected. Mard Geer was so impressed by this that he force-recruited Silver, put him through some method that assured his loyalty (brainwashing, mental contidioning, direct control or whatever) and made him the replacement for the Demon he killed.

And out of cruelty he forced Silver to work close with Keith, who really is the revived Deliora, maybe even giving Keith control over whatever mechanism kept Silver in check.