I know that it was INK that started Z day in the first place, he went crazy and killed his family and other people, so I think that he knew the only way to start z day was by getting an army. the toughest and the expendable. so prison sounds about correct. Now he just had to control them and he found out how to that. what way can he remember a formula? by tattooing it. I am sorry but I think he started the whole thing. I know that people say he was in jail or transport when it broke out, but that doesnt mean he couldnt leave something with a timer or pay someone to do something for him. INK letting puck go and riley, He does know what he is doing. I think he likes the hunt and he did all this on purpose so people can fear him, thats why he leaves some of them alive. I might be crazy but I just keep thinking this.