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Why can't theymos just check Werner's IP and see if it equals Garr's? Yeah yeah Tor etc, but if Garr was this careless, he's probably more careless.
Gar's identity is not in question -- he both admitted & apologized.
TL;DR: theymos' reply: shilling and socks perfectly valid here.
Yes, Garr could have just kept his mouth shut but thought being open was the right thing to do.