I personally think that it's something non-human that's controlling all the zombies and creatures that may or may not have ever been human, I think that a lot of the "zombies" being described in the story now shouldn't be called zombies, Like the Little Ones (or not-so little anymore,) the Behemoths, the "Jumpers" (that's what Bill called it.) And I doubt Pin Stripes is the only "smart" zombie out there, it would make more sense if some zombies were generally smarter than others.
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