This is way too many highlights for an ass kicking, but I wanted to finish this TD drive before touching on some more defensive gaffes. Here's the TD catch.
The 49ers look like they are running the Spot concept, but the Corner route is changed to a skinny Post (yellow) that hits the seam between the two deep zones. Red and orange's routes are exactly like how Spot is executed. This again plays off of offensive tendencies which is important when playing divisional opponents who are familiar with all the route combinations that other divisional teams like to run.
Versus Cover3
Vance's headfake is used to get the blue defender leaning the wrong way.
Everything looks like the Spot concept as Vance head fakes to the Corner route. The blue defender is in perfect position to defend a Corner route, but it's not a Corner route.
Gabbert starting to throw before Vance exits his break.
5 step timing with a hitch. By throwing before Vance completes his break, the middle safety can't react in time to Vance's route. Notice the blue defender reacting to Vance's head fake - it widens the seam.