When people utter the words "2-3 zone," what's the first thing that comes to mind? Most people would probably say Syracuse Orange or Jim Boeheim. Boeheim has made the 2-3 zone famous not because he was the originator of the defense, but because he has taught it so well and because he plays it 40 minutes per game. No other coach does that.
If it's been said once, it's been said a million times. "You can't simulate the length of Syracuse's 2-3 zone in practice," or "They've played against 2-3 zone this year, but none like Syracuse's.