User blog comment:FairyRaven/Fairy Tail Chapter 368: The Third Seal, Review and Commentary/@comment-112.133.213.21-20140126135159/@comment-24403746-20140127171226

I honestly have no clue... It's only a speculation (and not even mine just a somehow common speculation) I don't know how he got back in time if that's the case. Silver is in my opinion still a badass character shrouded in mystery :P and only related to Gray in someway and not that he is the future version only that this is a possibility for some people. ;)