The Ghoul's Chems Are Keeping Him Alive

The Ghoul's vials are not managing stable symptoms. They are arresting an active degenerative process, and without continuous dosing, he will cross from functional to feral. The coughing episode at Wilzig's corpse is severe enough to stop his movement entirely, and the speed of his self-medication indicates a practiced emergency response, not a comfort routine. The theory holds that whatever chemical compound occupies those vials is the only thing maintaining the neurological or physiological threshold between a ghoul who reasons and a ghoul who does not.

The destruction of his supply during the gulper encounter is where this stops being backstory and becomes plot mechanics. His fury when he opens the bag and finds the vials smashed is disproportionate to any material loss a wasteland survivor would register as significant. A man who has outlasted civilization does not lose his composed, detached demeanor over destroyed rations. He loses it over a countdown that has just started. That reaction is only coherent if the loss represents a survival crisis with a hard deadline.

The precise question the show has not answered is what the vials actually contain and whether a resupply exists anywhere in the wasteland, because those two facts determine whether the Ghoul's pursuit of Wilzig's head is still mercenary or has become the only available path to his next dose. If the compound is rare, proprietary, or tied to a specific faction, then whoever commissioned the retrieval may hold supply leverage over him that reframes every scene of apparent autonomy he has shown. The Ghoul may not be working the job. He may be working toward the only person who can keep him from going feral.