I'd completely ignore writer intent here, considering that the McGuffin was never really given any "treknological" thought and thus gives the story unintentional complications if not further rationalized...
Also, Kirk was indeed accused of premature
deployment, whatever the exact word on the nature of that deployment. Nobody seemed to suggest that deployment wouldn't have been the ultimate goal. If something has been built to be deliberately deployed (be it to its assignment, or to its doom) without any intent of later recovery, I'm more or less happy with using "jettison" as the word for that action.