The Vikings have their Posse (or 11) personnel on the field (three wide receivers, one tight end, one running back) in a Doubles Slot formation with a stack alignment to the closed (strong) side. The Eagles counter by sending pressure out of their base 3-4 front. They rush five and drop six with a three-deep, three-under zone shell in the back end.
With the tight end picking up the rush linebacker off the edge, and the running back sliding to account for the inside pressure, the Vikings can give Cassel time to throw. That allows the quarterback to work the closed side "sail" combination (fade-corner) or comeback to Jerome Simpson on the open (weak) side dig route (square-in) versus cornerback Bradley Fletcher.
Simpson takes a hard, inside release, stems his route vertically up the field and breaks the dig at a depth of 12 to 15 yards with Fletcher playing from an outside leverage position to funnel the receiver to the free safety.
Cassel climbs the pocket and targets Simpson on the dig route. With the "middle hook" defender, DeMeco Ryans, reading through to the quarterback, Cassel has to deliver this ball on time to avoid bringing the linebacker into play.
Because of Fletcher's initial alignment (outside shade), Simpson can pin the cornerback on his break back to the middle of the field, secure the catch and absorb the hit from Ryans to pick up a 20-yard gain.
On Sunday night, Cutler will see pressure from the Eagles defensive game plan. However, because of the matchups the Bears can create with Brandon Marshall and Alshon Jeffery, the quarterback will have opportunities to throw deep, inside breaking routes to move the sticks.