Following the creation concept that creation processes differed from preservation processes, it is suggested that God endowed each created kind, at the time of its creation, with potential for vast variety.
The characters emerge from my rather twisted mind. That's another enjoyable part of the job making stuff up.
In our story logic which we're making up, if we're saying he's alive, then like a quadriplegic who's in bed he can move his head and shoulders, but he can't move his arms. If he could just turn on that power to his legs and arms, the nerves could get through and he could walk.