I can’t vote for anyone but Zarek. Gaeta’s gone completely off the reservation, true, but he’s not a guy who’s been manipulating and using people for personal gain under the guise of greater good since the start (or very near it). He’s merely having a case of the Anakins and letting all of his doubts and rage and guilt make a nice tasty stew to boil the future of humanity in.
Also, Richard Hatch sells it like nobody’s business. The guy nearly begs you to hate him.