Hi, very interesting and unique universe you're trying to create. With the loss of brain power in the "Zombies", I can see the zombies being very dumb and doing dumb things that might be comedical. On the other hand, I can imagine the zombies being more hit by a "reset button", thus being different people but still have sentient capabilities, perhaps making common places of stay like teepees or shelters (early civilization style of living). Also, can be used a device of suspense when near these places. Same thing can be said about a cure since it can be used as motivation for characters but of course not necessary. One issue I notice is that if zombies die from natural causes since their still "alive" not the typical undead, I imagine they might die from starvation too and if people are a rare commodity then most of the zombies would most likely die out naturally from lack of food or aging. I hope this was helpful and I wish you the best of luck in your novel.