Horns and DHO (which is really just pick and roll except the picker starts with the ball) leads to ball handler having an advantage over his defender, which leads to layups/dunks off that action and then the roll man. Not really designed for perimeter to interior passing like the flex and the triangle generally do.
That Andre Miller overplay is the only time I've seen horns run where there's an opening under the basket.
I also do not recall a motion set to free up a shooter. I'm trying to remember a Jazz three point shot that wasn't off the dribble or a set catch and shoot.
