Shorter: The GoW has a hierarchy de jure, but no hierarchy de facto.
Regardless of what that topic says, there really is no hierarchy. Come into the Writers chatroom and say "take me to your leader" and you're just going to get laughed at. At best you have the
concept of Guild Councilors. Branan's quote you cited sumarizes my view of the "power" too. The jobs are informal and the "establishment" wants them to remain so in order to create a more enjoyable experience for casual writers. In short, anyone who takes themselves too seriously in their position will be flogged.
That's not a hierarchy in my view. Most other Guilds (that exist) have a stereotypical hierarchy resembling the D'ni structures: The top person is a Grand Master with Guild Masters below him/her, etc. While it can feel good in some cases to have that (and it certainly helps the ego to say "I was promoted to Guild Captain!") I think that sort of structure lacks much meaning for the modern Guilds since the titles are arbitrary (what does the Grand Master DO besides wave his/her scepter around?).
The reason I didn't get into this is: A. I don't see it as an issue for the Guild, and B. it's a more general issue not tied to a single Guild. What this will turn into is a post on general Uru politics because this really gets down to core issues this community has yet to work around. Either way, that's why issues like this were not brought up in the GoW article.
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-Whilyam