Now I always figured Roy Thomas had the 4th draft script when writing the comic, but its interesting that they omitted Vader crushing it. Could that be due to the “Marvel Way” of writing/drawing that the crushing cup part got cut? I always forget exactly how the Marvel Way worked, but I know it often lead to inconsistencies and even contradictions between what was written and what was drawn.
Basically the writer types up with a basic plot rather than a full script, hands it over to the illustrator who fleshes the plot out in their illustrations, hands the finished artwork over to the writer, who finally adds in the dialogue/descriptions.