User blog comment:FairyRaven/Fairy Tail Chapter 366: 1000 Souls, Review and Commentary/@comment-92.37.55.98-20140109154110/@comment-7418318-20140109155235

While the idea by itself would have been nice, I wouldn't like it due F-Rogue already going the whole "good guy turned evil due to a severe loss and traveled back in time" route.

And that this happened with just one arc in between (and a rather short one to boot) makes it rather unlikely I think.

I was groaning in disappointment when Natsu said that Silver smelled like Gray. The two are related and just by chance the lost son happens to get rescued and taught magic by another ice mage?

If they really are related I hope it will be many generations apart, like Silver getting a woman pregnant some 400 years ago and Gray being a very distand descendant, rather than his direct son.

If Silver turns out to be the one who sent Deliora to destroy Gray's hometown, Silver might be annoyed because it was due to Gray that Ul was dragged into the conflict which saw Deliora defeated. It might be a bit of a stretch, but anything is better than pulling a Darth Vader.