that's right, broken spines and big bleeding slashes make surviving a lot harder.
in fact, didn't zoro kill the green-haired meowban brother?
when butchie stood up, kuro said something like "this one's still alive. looks like your claws need sharpening." implying that the other guy did indeed die.
EDIT: and i just remembered that zoro flat out said that he killed the officer agent that tried recruiting him to baroqueworks.