My understanding re: copyright was that the raw output of the AI cannot be copyrighted. But his rigging and mesh maps and otherwise creatively-directed work to

My understanding re: copyright was that the raw output of the AI cannot be copyrighted. But his rigging and mesh maps and otherwise creatively-directed work to take that raw material and make it look good? Surely he has copyright on those? It's just that in theory, anybody else can take the raw output of the AI and do all that extra work on it themselves with no copyright violation.