Imagine a person that is paralysed because the connection between the motor region in the cortex and the motor apparatus in the body (neurons) is comprised.
What happens to the neurons that were actively involved in bodily motion when this person was not yet paralysed?
Will they continue to do what they always did?
Will they know that the body is out of reach and start doing other things?
I can imagine that they don't receive feedback from the body and thereby know that they are not needed anymore so they might go in in different processes.