i've NEVER watched the show, but i did watch the last hour of the season finale...and i kinna guessed that the guy with no dick was def. the carver, even when he got "carved", i thought he def. did it to himself to throw everyone off. i also thought at one point that the cop chick was in on it too.
i dunno...never watched it, but i knew who it was. (of course, i didn't think they were bro and sis until the end when she was telling the story...her manerisms kinna gave it a way that she was the sister)