I don’t remember 6 saying that. In any event, I don’t think we’ve seen all the sleeper models. Number 6, news guy and scavenger guy all know that they are Cylons, apparently at all times. They infiltrate by acting human, but they aren’t sleepers. Boomer is the only one so far that seems like a sleeper, that is, she isn’t really sure whether she’s a Cylon or not. At least the one on Galactica isn’t sure yet, the Boomer on Caprica with Helo may not know.
So I’d say we haven’t seen all the sleeper models yet. Remember too, during the beginning of each show, they come right out and say, “The Cylons were created by man. They rebelled. They evolved. They look and feel human. Some are programmed to think they are human. There are many copies.”
That last part is significant. The text of “Some are programmed to think they are human,” flashes red for emphasis, and they immediately show Boomer. So again, I think she’s the only one so far shown to think she’s human. Who are the other models that think they’re human?
That’s the guy who plays Tigh’s normal voice too, or at least it was on his last series. He played a hard-drinking detective in the Canadian series Cold Squad, which looks like it was the inspiration for Cold Case Files. He plays Tigh pretty much the same way, so I’m guessing the writers saw his other performance and decided that’s what Tigh should be like.
Why couldn’t he be? I mean, yes, Tricia Helfer is amazingly freaking hot. But then again, the same holds true for many, if not most, actresses in scifi/action movies, many of which have “romantic” subplots. Unless we posit that all actors playing opposite hot women have to be gay (which just seems statistically unlikely), we’re forced to conclude that actors, as professionals, learn to deal with it.