Milt,
In previous life, commanded the F-16 Combined Test Force. Your F-16 friend was correct, Max AB is not allowed due to tire rotation on the stationary wheel when the brakes are set. At brake release, max AB is available immediately, all the way up to segment 5, as far as the wheels are concerned. The progression to segment 5 AB is a function of engine stall margin, not wheel/tire limits from that point on.
Cheers,
Stump