The Cylons had Raptors in thier Cargo bays, no reason they could have Vipers. but we saw Kara go boo, and they stated the atmospheric pressure was about to crush the vipers let along a person... so yeah Kara is totally one of the final 5, but I get the feeling the final 5 arn't like thier head's in the sand, projecting, childish brothers among the normal cylons.