I don't have a dog in this hunt, but do you not see how your statement opens up so many doors that it may be impossible to ever close them all?
Not really. We're not talking about someone in a wheelchair or even someone like Christopher Reeves. We're talking about someone who is, for all intents and purposes, brain dead (though she retains some very low-level autonomic brain function). If her injuries had been so bad as to require a respirator, we wouldn't even be having this discussion as everyone in her family would have long ago agreed to take her off life support.
The problem is, her parents have latched on, in their grief, to brief instances where the autonomic functions of her brain make it appear like she is responding to their voices. They disregard the other 99.99% of the time where no such coincidences occur. It is understandable that grief-stricken parents want to hold onto the false hope of these coincidental responses. However, objective observers, including a doctor who sat with TS for over 20 days, agree that any "responses" are nothing more than coincidental.