For those who believe that it's not anybody in the photo (which I don't) Dualla and Gaeta have been popular choices. You act like this is a revelation when her name has been a regular topic of discussion, because of the Adama is a Cylon line and many others. Certainly Dualla has had a surprising ability to put herself close to the seats of power, which leads many to suspect her.

Leoben, if he is an ordinary Cylon, should of course know nothing of the #1 Cylon, whether it's an Adama or otherwise. However the writers might ignore that. And while the hybrid has prophetic powers, he was correctly using tense when he talked about the unveiling of the 4 being in the future but all of them being in shadow now. So it's harder to buy this talk of Dualla
being in need of redemption for future sins.