If Gh15 revealed who he was, it would kill the mystery.
Why not enjoy it while you can?
Personally, I think Gh15 is numerous people who all post on his account. This is why they use the same terminology... almost as if it's a trademark.
I think his "elves" tell him what's going on and he may tell them what to post at times. Nobody else here carries the mystique. I think it's a pretty original gimmick ~ he should stick with it.
Why ruin it?