The 11 or 51 point choice is just for the initial point you can select. It is independent of the number of points for AF-C tracking(S, d9, d21, d51, 3d, or AUTO). Once the initial point is selected the D4 (and most/all Nikon DSLRs) uses the appropriate subset of the 51 focus points for tracking the subject.
You set the number of points for tracking using by pushing the button in the center of of the AF switch and turning the front command dial. AF-S or AF-C is selected by turning the rear command dial while holding the AF button
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