So after the 49ers offense started to stall, Pinion shanks a punt and DAL gets the ball back near their own 40 yard line. 49ers played soft man coverage to keep everything in front of them and Dak shows good patience completing four passes on consecutive plays for 8, 7, 7, 7 yards. That's nearly 30 yards "free" and gets DAL into FG range - inexcusable. Eventually the 49ers buckle down and get into a 3rd & 6 situation.
49ers will again overload the right side of the OL to give the look of blitz, but they are actually coming with a standard 4 man rush, playing Cover3 with man coverage on the backside WR.
The fail of this play comes on the rush. Bethea sneaks in late, right before the snap, and will be the 4th rusher. The 4 rushers are the nose tackle, AA, Brooks, and Bethea.
The 49ers achieve their goal - get a 3v2 situation on the right side of the OL. AA, Bethea, and Brooks versus the RG/RT. What needs to happen now is AA and Brooks have proper spacing to give Bethea a nice lane to run through.
AA attacks the outside shoulder of the RG. This closes the lane for Bethea. AA needs to attack the inside shoulder (yellow). By hitting the wrong gap, the RT is able to block both Brooks and Bethea.
Meanwhile, Eli drops into coverage to his Hook zone. Instead of gaining some depth to keep things in front of him, he is oblivious to the drag route in his area (yellow).
Yellow pulls up and finds a soft spot. Gets the pass and converts the 3rd down. DAL eventually scores the tying TD with 16 seconds left in the half.
Defenders in zone coverage need to train their eyes to look around and be aware of their space. Where is the help? What routes are relevant to their assigned zone?