>I am thinking that if the focus points are further apart and >cover more of the image, tracking will be better.
This can be a blessing or a curse. If you are shooting singular subjects against a clean background, the wide spread focus points can be terrific. If you need to pick a subject out of a crowd (like most sports shooters have to do), it means that you get locked to using a single focus point most of the time, or at most nine central ones. You don't get to use the great 3D matrix stuff because your focus walks all over the field as you pan. Been there, done that with the DX cameras. I shoot single point 95% of the time now, unless I am doing tennis or some other singular activity.