Could mean nothing. It is possible to have total lower body paralysis from nothing more than inflammation in the wrong area. When the inflammation settles down, feeling returns to that area. Thats why so many spine and brain injuries are 'wait and see' situations.
Sometimes if I over do it, I get almost complete lack of feeling in my right hand, mostly in the last 2 fingers, when the swelling around my fusion site goes down, it improves.
Not sure why this guy wants a totally new MRI, but I suspect the old one didnt have a view or an angle that he wants. each doctor has their own way of doing things.
Sorry I couldnt be more help, someone else may have more advice for you.
Your Friend, Fabby