been going over everything in my mind; and something odd popped up. What if Randy is smart enough, that all this time he has been working on a way to reverse Ink's madness. take a look at the evidence.
Randy had Tanya, he knocked her out. not turned her but knocked her out. He also was keeping the other biters away from her when she was out. I think that he needed Tanya to help him turn things back.
then later when Micheal and army went after him and he dropped a bag full of the chemicals.
then him biting Datu. to not only to get Micheal's attention but he was trying to see if the his anti zombie venom would work.

what do you think?