Lurker, the Spurs are violating clause E of those rules.
By the way I hate zone defense with a passion. It used to be illegal in the NBA, and they changed the rules because the players are so inferior to the good old days.
The older fans here remember all the Celtics and Lakers teams that were able to play very physical ball and effective defence, without using a zone.
But the Spurs have taken the use of the zone to the next level- a level at which if the NBA has any brains will ban. It is bad for basketball fans everywhere- and much much worse in it's own way than the Detroit bad-boy teams of the late 80's.
If other teams start emulating this aspect of the Spurs people will stop watching. It destroys the flow of the game, because people simply get in the way of the ball handler.
The Spurs bend the rules on both offense and defense. Moving screens, illegal picks all the dirty tricks in the book. If I was a Spurs fan I would love it, but I'm a fan of the NBA. IMO, the league has ruined the game by expanding too far, and reducing the talent level too thinly. Any team from the 80's would destroy this Spurs team with no problem at all. It used to take 4 all-stars to win with a bunch of solid role players to take the Championship. Now, it takes only 1 with some above-average role players.
There could never be a showtime Lakers against the Spurs transition D as the rules currently stand. In the old days, under the old rules, they wouldn't stand a chance.