The Last Cylon: Who is the Fifth of the Final Five in "Battlestar Galactica"

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Now that the above evidence has all been laid out, it becomes apparent to me that Lee Adama is, in fact, the Last Cylon yet unmasked.

As to why he hasn't been revealed yet... there's no real information for why it hasn't happened, and any hypothesis would be too weak to pursue at this point in time.

Ultimately, this doesn't and shouldn't come as a surprise, as the overall story deals with the relationship between siblings. Whether they be father versus son, or man versus machine, Battlestar Galactica has always been driven by this basic, timeless set of relationships.

In summation, there is no better mirror to how complex the Cylon relationship with humanity has become than Lee Adama's relationship to his father. For as Romo Lampkin said in "The Son Also Rises": "There's no greater ally, no force more powerful, no enemy more resolved than a son who chooses to step from his father's shadow."

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