Here's the big 4th down play.
49ers run two verticals up the sideline (Lloyd, Crabs). I am fairly confident that there should have been a third vertical by VD.
NO: cover2 zone
ADavis gets beat around the edge and Kap has to evade the pressure. The DE near VD gives VD a smack instead immediately starting his pass rush. This knocks VD down. This will end up greatly affecting the play.
Blue circles are the safeties' deep 1/2 assignments in cover2. The orange circles are the holes in cover2 Zone. Lloyd's and Crab's routes are designed to attack the holes along the sideline. VD's route would have attacked the middle of the field had he not fallen down due to the DE shoving him. It would have been 3 vertical routes versus the two deep safeties. Boldin's route is used to hold the safety for a split second to buy Lloyd some room. Kap starts to roll right. #32 is safety Kenny Vacarro - the first safety selected in the 2013 draft (3 picks before Reid). Purple (Hook defender) and Blue (Hook/Curl defender) will factor large in this play.
With VD never providing a threat to the middle of the field, the safety can widen out towards the sideline to defend Lloyd with no fear of leaving the middle of the field open. The window to Lloyd has closed. As Kap rolls right, the Hook defender (purple) mirrors him.
With Kap rolled out to the right, the Hook defender (purple) flows towards Kap. Gore takes the Hook/Curl defender (blue) with him. Vaccaro abandons his deep zone when he sees that no one is near VD (hook/curl zone).
With the deep safety removed, Crabs is wide open. Kap is mid windup.
Crabs just caught the ball.
Kap's rollout takes away the Hook defender. Gore's route takes away the Hook/Curl defender, which causes VD to be open. Vaccaro comes up to defend VD which causes Crabs to be open. Had Vaccaro not come up to defend VD, VD would have been wide open. Still, a deep safety should never abandon his zone when there is a deep threat nearby.
+51
Really? 
