Last year, zone defense was, well, awful. Defenders would protect areas where there were no players or seemingly ignore particular areas of the field that absolutely needed to be defended. This year, it seems like defensive players will now actually work as a team and try to figure out what zones need to be defended and figure out what player should be defending them at any one point.
Basically, last year every defensive AI player was oblivious to other defenders on the field. If a safety was supposed to protect one area, then that was the area that would be defended no matter what. This year, defenders will literally point to each other and opposing players to signify that they are handing off the coverage of that receiver to someone else. It's a clear visual cue, and it's an effective one. It seems like now you should know why a coverage was blown, and it's also a way to acknowledge that these defenders actually have some awareness of both teammates and opponents.
In addition to that tweak, zone defenders will also shift their coverages based on where the receivers actually are on the field -- novel concept. If the offense sets up with a flooded right side of the field, defenders on the left side will actually move to protect the farthest portion to the right of their zones. It does not mean they will abandon their coverage area, but rather they just now notice that the closest danger will be coming from the right side.
When it comes to the flats, they also should be defended better this year. I am not ashamed to admit that I looked to the flats quite a bit last year; it was an easy low-hanging fruit when you wanted some easy yards. This year man and zone defenses both seem to be focusing on not allowing players in the flats to pile up YAC. I actually tested this out on quite a few plays during the two quarters I played, and this new-found defensive fervor in the flats seems genuine.
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