It's pretty obvious to me thanks to this last episode that Ink/Bill Roberts has evil intensions. Surely he creates, and uses the Jail for testing to see how long his Zombies last as they kill one another. His last testing location was the Arena. As for Randy, his motivations don't seem entirely clear yet, though I have a hunch he's the good Zombie. Ink was convicted for murder and is classified as a Serial Killer, so it's safe to say that his intensions as a Zombie/monster will also be evil, as Burt keeps saying. So with that, I wonder where Randy comes in. If anyone should kill Ink, it should be Michael, as Puck suggested. This was a great episode.