Walking Dead works differently than most think (because of bad wording on the tooltip). You need to be cured for a total of your max HP, not to full (or cured to 100 HP) as most think. If you have 1 HP and Benediction is cast on you, you still miss that 1 HP so to speak. That and I heard Benediction may be bugged regarding the healing count towards Living Dead. May be wrong on that one though.