< rest deleted>Isn't the question of WHAT is authoritative the question here? WHO is authoritative is another discussion.
My view is that authoritative means what is either what is entered by the domain owner (or given via proxy for whois privacy, which should be free to all entities) or an identical copy of it kept in sync with any changes made by the owner as they are made. In so far as "accurate" data is required, it should be after verification of the data by the consumer for whatever fields have to go through verification.