This is  version 4 of my question due to changes.
5 stars and no Request for Answer Clarification guaranteed.

Does Probonopublico-ga's question "Over 1,000 Comments, please!" hold
an additional prestigious world record: the greatest number of
different G-A nicknames posting comments to a Gooogle-Answers
question?

Answer seems to be 'Yes' by the following:

1.
  The question seems to be answerable based on:  
Subject: Re: Which Question has attracted the most Comments?    
Answered By: jackburton-ga on 17 Jun 2003 05:16 PDT    
://www.google.com/search?sourceid=navclient&ie=UTF-8&oe=UTF-8&q=%22Which+Question+has+attracted+the+most+Comments%3F%22

2.
   The list of 8 nicknames having multiple comments at    
http://answers.google.com/answers/main?cmd=threadview&id=50956    
 is: 
 
rubik-ga 
journalist-ga 
starrebekah-ga 
davidsar-ga 
007wineguy-ga 
letterrip-ga 
kemlo-ga 
justaskscott-ga 
. 
The difference --between 108 (the no. of comments) and the result of
subtraction of 8 from the no. of occurrances of these nicknames in
comments-- appears to be less than the no. of nicknames listed at
http://answers.google.com/answers/main?cmd=threadview&id=234933 
(and can be counted by copying it into MS Word document, 'Select
all','Numbering').