An intelligent response without consciousness is different to an intelligent response with consciousness. That is the re-definition. We can speculate that the

An intelligent response without consciousness is different to an intelligent response with consciousness. That is the re-definition. We can speculate that the full human experience of pain may exist in the absence of a brain. And we can estimate the probability of that being the case in plants. Do you really think that probability is high? Also, plants can and do react to damage and even touch.