And I'll have to disagree with you here. You can't change defenses game to game or possession to possession. That's because defense is not played by two guys defending the screen in any particular way; it's because the other guys also have to know.
- If you're going to hedge, then the other guys have to know and look for the screener either going to the basket or going to a spot-up. And the other guys need to know which kind of player that is and adjust according to the hedge.
- If you're going to switch, then the other guys need to know in case the big goes to the block and posts up. The other guys need to know to help the smaller teammate defend the big.
- If you're going to trap, then the other guys need to know in order to cut off the 1-pass lanes to make the trap more effective and possibly get a steal.
- If you're going to "jam" (your term - I learned to call it "play under the screen"), then the other guys need to know because the passing lane will be easier while the defense is behind the screener and they need to tighten up the passing lanes at precisely that time.
- If you're going to "show" (again, your term - I learned to call it "help and recover"), since the angle you're allowing is better, the other guys need to know this so they can appropriately sag into the lane to stop the drive to the basket.
The ONLY way to get good at any one of these techniques is to practice them day after day after day, ad nauseum. And have the coaches constantly watch for proper footwork, hand placement, positioning, etc. It's not something you can turn on and turn off. It's also not something that you wake up one day and say "I'm going to hedge today".
Fran has picked one method - the hedge - and gone with it. I don't necessarily agree with that, but it seems to be working for them and has made it difficult for our opponents. I will say that it is completely different than anything Woody had to do in high school and it's probably taken this long for him to learn to hedge effectively;
I would add that Gabe probably didn't hedge much in high school either. Most teams that send their centers out to set the pick for their point guards are relying on the opponents' centers to be unable to hedge. I know I never had a problem going out to set a screen for our point guard but I would have had lots of problems hedging defensively (we used a "jam" technique when I played).