User blog comment:PUNCHURPREGNANT/Gray and Silver Predictions/@comment-24784846-20140507204723

I don't think Silver is future Gray, and the reason being so is because Silver was turned Etherious by Zeref 400 years ago and this is stated that by Cobra all of the 9 gates are demon from Zeref's book, so Silver existed 400 years ago, perhaps Silver is a version(not sure which one) of Gray that went to the past with Team Natsu and Gray got stuck in the past, later Zeref found him and turned him.. I will laugh if this turns out true