Maybe it was just a random observation by the neuro. It was interesting to him that you were still walking when his other patients who can't do that, aren't. I wouldn't take it as more than that. I have failed that test before when I was at my worst, I was having great difficulty walking with a cane at that time. I have since improved a lot and can pass that test again.

There are no absolutes in neurology. Everyone's brains accomodate for damage differently. I wouldn't worry about it.