I've sort of left that up to everyone. There aren't any set ranks; that's really for any future leader (or anyone who wants to join the Silence) to decide. You can really join with any rank you want, but you might not be able to keep it forever. The Silence isn't organized yet, but it should be in the near future by a new leader arising.
The only current plot-set rank is Oracle. Technically, they can be called Revolutionaries, so you can refer to them as that if you want for now.
There will also later in the future be a set naming system. The way I have it figured, is that it'll be along the lines of like... renegade Time Lord names. (IE: The Claw, The Hunter, The Chaser, et cetera). They've not reached that point yet though.
Last Edit: Sept 23, 2011 18:33:58 GMT -5 by Durango