There is actually a lot to teach regarding zone defenses and movements/assignments with it. The couple of times we have tried it this year has not looked good. That's not to say though that it's not worth the practice time to at least have an acceptable amount of proficiency with it. Given our problems guarding the 4 spot, it may be.I'm no expert on this, but every coach teaches his team how to move the ball against a zone and find the soft spots (corner, 4 hole) so why would it be so hard to teach the team how to play a zone on occasion?