Botany Bay wrote:
"They have my ship, discarding their own worthless vessel."
Kirk couldn't turn around and go get it? It's not like they went far and the life support canisters were still functioning. Was Kirk really able to keep 70 some-odd "supermen" at bay on the Enterprise until they got to Ceti Alpha? Sure, McCoy could probably knock them out, or they could keep pumping anesthesia gas into a room or two with all of them in there, but it would just be easier to shove them back into their little coffins and transport them to the planet in the Botany Bay. This was implied in TWOK anyway.