User blog comment:Omega natsu2/Chapter 390: The Story of a Boy, Predictions./@comment-117.195.48.214-20140620113120

Gaah, so confusing!

Silver smells like Gray and Gray recognizes his face and voice. So they might be blood relatives or something. Except ... Natsu never knew (presumably) that Cana and Gildarts were related, neither did he ever comment that they smelled the same, as he did on meeting Silver. That most probably means that being blood reltives has nothing to do with smell. And Gray says that, though he remembers the face and voice, he doesn't know the person. So ... did he only meet the person briefly when he was very young? Or does he mean that the person he knew had an extremely different personality and could never be Silver? There's also the fact that Silver is definitely a Demon (extremely eager to see his Demon Form).

The thoery I might go with is that Silver is a Demon who lost his human form and asked Keith to prepare a human body for him. The body chosen was that of Gray's dead dad, but, due to some mistake, Silver got some of his memories and feelings, which include feelings of affection towards Gray. That's why Silver hates Gray so much.

Actually, looking back at it, don't really like it that much. It means the Ice Devil Slayer thing is pure coincidence. The mistake seems far-fetched. Maybe somebody who finds it plausible can refine it ... >.>