I know, but the only other thing I can do is to disable ALL comments on the ENTIRE wiki.  I keep blocking all the IP addresses, but they keep returning with new IPs.  Just don't engage them, don't pay any attention to them, and please don't argue with them, you can pretty much tell which comments are from the user in question.  Just ignore them and I'll keep blocking them.  Unless it gets to the point that the majority of the wiki users WANT me to disable comments, I won't disable them because I think that it's a good way for us to communicate our thoughts and theories.