MIAMI – The zone defense is killing the Miami Heat. OK, it’s not really killing the Heat. After all, they won 58 games and went to the NBA Finals last year, and so far they’re 5-1 this year. But you know what I mean. The zone is hurting the Heat badly when applied correctly by good teams. Dallas did it in the Finals last year. Boston did it this year. And on Monday, Atlanta did it well enough to defeat the Heat,