You may want to take the minor edit http://en.wikipedia.org/wiki/Help:Minor_edit flag into account when determining the "at least five of the principal authors of the Document".
E.g. in the "USS Nautilus (SSN-571)" article in Tim Cruze's book "Big Science", "Furry" is listed as one of the principal authors, eventho user:Furry only made 2 minor edits on 2005-09-30 to the article (deleting a space and a full stop). user:The Epopt completely rewrote the article on 2004-01-05t23:52:26z, but is not listed as a principal author.
Ignoring edits that were reverted http://en.wikipedia.org/wiki/WP:RV would also improve the authors list.
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