What if they are pygmy zombies? They've found bones of pygmy Mastadons on an island where they evolved to be smaller due to the restricted food supply. They lasted longer there than anywhere else I believe.
My theory, that I have, which is to say is mine, is this*: Instead of depending on evolution, the zomboids seem to evolve quickly to fill a niche without depending on pesky reproduction. If they continue to evolve, and the food supply is dwindling, then violà, smaller is better.
A scarier idea is Ink breeding zombie babies.
*Anne E. Elk
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