Is Leoben an Angel?
There's a scene of him painting the same pattern that Kara obsesses over, and then they show him having a vision of Kara and himself on New Caprica during the interrogation.
Is he supposed to be the Cylon equivalent to what Starbuck was? (Much like how Gaius and Six held the same roles in their species.)
Mister, life is swell in a padded cell, it'll chase those blues away.