Originally Posted by wileedog
In a Cover 2 the emphasis is not QB disruption. Its limiting big plays and dislodging receivers from the ball. That's what safeties are for.
To an extent, but it's also meant to make the QBs hold the ball longer (taking away the short to intermediate routes), giving the pressure a chance to get there. If the pressure doesn't get there, then the receivers can work over the safeties downfield.
That's one reason you want the corners to press, to keep the receivers from getting on the safeties too fast. Ideally, pressure then forces the quarterback to have to try to fit the ball in where the corners or linebackers can jump in front or the safeties can come up and dislodge it.