I don't believe that's true. If Duke, for example, were to give you +rep, but declined adding a comment, it'd appear as N/A, but with a green dot, indicating that you'd been given the rep points that he is worth. I'm sure I have N/A reps with green dots. It's only new folks that haven't got the requisite number of posts that give grey dots, and they can give them with or without a comment. I have a few grey dot reps with comments, and some with N/A. The grey dot just indicates that although their comments, positive or negative, have been taken into account for your overall reputation rating, e.g. somewhat positive or very positive, for an individual post, but they haven't contributed any reputation points to your overall reputation points total. Correct me if this is wrong. *edit* I'm right, as these pictures show.