Yes, they were in opposite alliances right pretty much from the begininig. Having said that, Kaycee is so laid back she's horizontal. That probably plus Bayleigh's crush on her (which wasn't apparent at the time), meant that they could hang out together without drama. Unlike say, Tyler, who had the insufferable audacity!!! to say good morning to Bay, thus infuriating her to the point of (literally, for those who don't watch BB) shrieking until she was spitting blood.
One of his finer qualities is being the Bayleigh whisperer.