User blog comment:B214/Chapter 482 review/@comment-27281341-20160418130317/@comment-1359322-20160418130920

If we go from how Mashima handle the Gray-Silver thing, yes Eileen may be who you say she is.

As for why Gray is not eating the ice, maybe it's because its not real ice or he doesn't want to use other form of magic besides Ice-Make when facing Ur (even though its a fake).