Meniscus, the producers have said that the "final five" are like the other Cylon models but somehow significantly different from them. I think that's how they're making room to explain how Tigh could have fought in the original Cylon war. I'm guessing they could be the original skin jobs (after the hybrids were developed, which happened in the original Cylon war) or replacements for people captured at that time.
I agree with you that D'Anna might have felt regret at having tortured Tigh and that's why she was so repentant. I also wouldn't be surprised to find out that Tigh's wife was the twelfth and she felt bad knowing that she was killed on New Caprica.
Also, seeing Sam and Apollo go for each other would be fantastic, but if I could wedge Helo in there I would.
I agree with you that D'Anna might have felt regret at having tortured Tigh and that's why she was so repentant. I also wouldn't be surprised to find out that Tigh's wife was the twelfth and she felt bad knowing that she was killed on New Caprica.
Also, seeing Sam and Apollo go for each other would be fantastic, but if I could wedge Helo in there I would.