Hi there I understand your concern and anxiety... And I have gone through your querie in detail...I would like to tell you that in neurological cases we also can't predict outcome we can give the best treatment possible...since he is improving he is responding positively for the treatment and he should be fine in couple of months... Just be in continues touch with your treating doctors with fallowup visits they will do the needful... And I want assure that he is been treated properly just trust your doctors and I wish him speed recovery.. Good luck.