Well not all QB Pressures are created the same.
Case: In 2004 the Cowboys D pressured McNabb in ~3 seconds of the snap, and then for OVER 10 seconds (clock was 3:09 at the snap, and was at 2:56 when he threw it), only for him to get away and throw a BOMB for a first down.
Leonardo Carson (#91) got good pressure, but didn't finish the play. Then 2 other Cowboys had a chance but McNabb made them look silly too.
That's what killed me about "Almost" Anthony Spencer. Sure, he would pressure the QB, but rarely finished the play, and allowed QBs to get away and make plays with their arm or feet.
Don't completely disagree with Campbell, but I've seen plenty of players that can create QB pressure, as they allow QBs to get away for big plays / losing containment.
Micah is pretty good causing MEANINGFUL pressure, but that is mostly before December/January. We really need to find away to preserve him so he can be an impact player late in the year / in the playoffs.
JMHO