As for Saul and Randy's bite: Saul seemed to immune against the z-agent or z-factor from the jumper (or maybe his hybrid-incident even earlier). Is his Zombie-Immunity so strong that his body could fend off z-agents from different types of zombies as well? Any time we witnessed infection, incubation, and transmutation the newly infected turned to become a zombie of the type which bit the victim; and this points towards the strong likelhyhood that there are different z-agents around. So I wonder: is the z-agent in a Smart One like Randy the same z-agent like within a regular? And would this have a different effect on Saul?
Just sayin' that I am not as certain as others here that Saul is safe from becoming a zeeh ...