Several months ago, I produced a draft new page for the Battlestar Galactica Wiki, to replace their old page on Cylon speculation. The Wiki tries to avoid speculative pages but this is an exception. While most people liked the page, for whatever reason it has not become the active page yet. Rather than wait, I offer a link to my Wiki Page on Fifth Cylon Clues.
Due to the nature of the Wiki, the page tries reasonably hard to avoid too much speculation, but rather documents items that have been observed in the show, or reported from official sources. In particular it is trying to document truly items that are truly extrahuman, or which are classic dramatic techniques. For example, “Gaeta is really smart” is not a clue, it’s just something suspicious, and all characters have something suspicious. “Tyrol feels a compulsion to wander into the wasteland and find the Temple of Five” is a real clue, something beyond what a normal human would do. Another real clue, again with Tyrol, was Cavil saying to him “I know you’re not a Cylon because I’m one and I haven’t seen you at the meetings.” (That’s a clue for both of them as it turns out.)
So if you think you see something that needs editing, that is the standard to follow. And frankly, I think I’ve listed every real clue, so if you think of something, chances are instead that it was rejected as circumstantial. If you’re not sure, leave a comment here.
From the Battlestar Galactica Analysis Blog