60D vs 7D - AF system

intended subject is son's football games. I understand that the 60D has 9 cross AF points and the 7D has 19 cross AF points.

Other than the number of points, what is the difference between the two ? If I am able to keep my subject on a focus point with the 60D, would there be any advantage to having a 7D ? From what I understand, for football it is recommended to use just one focus point. If that is true, then I don't see the advantage of the 7D. Maybe it is more than just the number of points, is the response of the system faster ?

There is also the 7D advantage of 8fps vs 5.3 for the 60D, but I'm trying to understand the AF system here.

Would appreciate your thoughts. Thanks !