She disappeared for awhile there, but the copy of Caprica Six that has tempted, taunted, seduced and haunted Gaius Baltar - in his own head mind you -- is one of the biggest mysteries in all of "BSG."  The strangest aspects of are, (1) none of the other Six's seem to be aware one of them is in Baltar's head, (2) this Six has a voice or perspective that is often giving advice that would help neither the Cylons or the Colonial fleet and (3) it can't be a figure of Baltar's imagination because on numerous occasions it has given specific instructions or advice that has saved the good doctor's life.  Now, it's clear Cavil has had a decades long plan at work here, but is this something even he could pull off? Or, is this that larger power at work?  If Moore and Eick don't reveal the origins of this relationship by the end of "Daybreak, Pt. 2," many fans are going to be mighty annoyed.