Neuroplasticity can't possibly be the only reason for re-acquiring lost skills due to a brain injury. Here's why...
My right hand was paralyzed. Not only does it move now, but I can sign the alphabet in ASL sign language. I do not use sign language.
Now if neuroplasticity is the only reason for regaining lost skills, then I could say that other people that have regained hand movement can also sign. Everyone has this ability.
This isn't true? I created something new?