I don't think Ellen's a Cylon. For one, we've never seen any Cylons actually impersonate anyone that was an actual person with a verifiable history and contacts. There's never been any 'bodysnatching' (that we know of) depicted. Plus, impersonating the wife of a military colonel would be pure stupidity, if not suicide. There's far too much that he could use to detect her level of truth, and they have far too long a history together. Additionally, Adama is no fool, either. He's known Tigh's wife for years, apparently, and I'm sure that it would be very difficult to get past the both of them. Maybe she could fool one for a little while, but not both. Attempting to do so would only tip the Cylons' hand, in showing that they have escalated their espionage campaigns to impersonating people that you already know, as opposed to inserting non-entities into society, and making them create a history for themselves. This would lead to even more stringent, anti-Cylon infiltrator security protocols, which would make Cylon espionage and sabotage that much harder, if not downright impossible.
Sooner, or later, were Tigh's wife a Cylon agent, she would mess up and the game would be up. Additionally, regardless of who she's married to, this does not really give her access to any real information. Remember, when she came back and asked what he was doing, he refused to tell her. This looked very routine for him; like he's used to keeping work product away from his wife (just the way he should).
As for superhuman capabilities, I have yet to see any in Boomer. Just because she could run for a while means diddly. Even when the Cylon agent Thrace interrogated broke the handcuffs, I've known of more than one case of people doing that, while I was in the Army Military Police, in order to avoid apprehension. They may be pretty tough, but I doubt they're really superhuman. You're also forgetting the fact that Helo has a serious, and untreated, leg injury, from when a piece of shrapnel penetrated the hull of their EW fighter, and went through his leg. He has not seen a doctor about this, and it's even possible that he's permanently damaged from it. Now further aggrevate this by remembering his constant ionizing radiation exposure. Remember when he ran into Six, how terrible he looked? He looked like he was going to die. While I'm sure the radiation medication may stop the effects of the radiation, I'm pretty certain it doesn't do too much (if anything) to address the damage the radiation has already done. Boomer's always been well aware (on Caprica) of her identity. She's been talking to other Cylon agents for long enough, so I'm sure the fact that she's an android was no secret from her. Only the Boomer on board Galactica seemed to not know what the real deal was.
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Sooner, or later, were Tigh's wife a Cylon agent, she would mess up and the game would be up. Additionally, regardless of who she's married to, this does not really give her access to any real information. Remember, when she came back and asked what he was doing, he refused to tell her. This looked very routine for him; like he's used to keeping work product away from his wife (just the way he should).
As for superhuman capabilities, I have yet to see any in Boomer. Just because she could run for a while means diddly. Even when the Cylon agent Thrace interrogated broke the handcuffs, I've known of more than one case of people doing that, while I was in the Army Military Police, in order to avoid apprehension. They may be pretty tough, but I doubt they're really superhuman. You're also forgetting the fact that Helo has a serious, and untreated, leg injury, from when a piece of shrapnel penetrated the hull of their EW fighter, and went through his leg. He has not seen a doctor about this, and it's even possible that he's permanently damaged from it. Now further aggrevate this by remembering his constant ionizing radiation exposure. Remember when he ran into Six, how terrible he looked? He looked like he was going to die. While I'm sure the radiation medication may stop the effects of the radiation, I'm pretty certain it doesn't do too much (if anything) to address the damage the radiation has already done. Boomer's always been well aware (on Caprica) of her identity. She's been talking to other Cylon agents for long enough, so I'm sure the fact that she's an android was no secret from her. Only the Boomer on board Galactica seemed to not know what the real deal was.