I have to say that I think the other >b>China Doll alias was just dreamt up for a bit of fun and because someone realised they could do it.
However, as pointed out by jno and Whiffey, if this user had let it go grey then it would be virtually impossible to spot the alias.
I emailed Ed and the techies as I don't particularly want to report whoever it is and have them banned from the site or cause any more bad feeling than there currently is on here. I did ask if a little word in their shell like might be more appropriate.
As I said before. I did find it quite amusing when I first saw it and honestly thing that if it was malicious then they'd have waited until it was grey to use it. But it is worrying that it's apparently so easy to do.