It's more about technique and coaching/scheme. Fangio, for whatever reason, LOVES to play his CB's way off on 3rd and longs AND has them back-pedaling. Simple, simple completions. In fact, at my sport bar, I always point out who the QB is going after pre-snap. Simple, usually, one plays a little closer to the LOS and the other is playing a mile off. Guess who the QB is going after? I swear, this happens ALL the time. And I'll never understand it. It's one thing if the team has challenged you time and time again deep and have won...THEN yeah, you may want to back off and keep things in front of you.
The other technique I freaking hate is that the CB's on the outside, often times, somehow end up in trail-mode and instead of running through the play (and turn their head around), they wait for the body language of the WR to demonstrate the ball has arrived and then swipe at it like a swarm of fllies...head forward. It almost always leads to at least a P.I. Worse off, it means the CB's are not instructed to be physical and keep the WR's in front of them, therefore, how can they SEE the QB AND make a play on the ball? Therefore, they don't, esp. on 3rd and longs. They rely on poorly thrown balls and drops. INT's have gone WAY down as a result.
On the flip side, other teams use their CB's to challenge WR's tight up at the LOS while keeping the WR in front of them AND they keep their eyes on the QB...now they can break on the ball as needed.
PS: The OP is talking about our weak links on defense. This has NOTHING to do with blame on the offense, people....stay on topic.
[ Edited by NCommand on Nov 13, 2013 at 10:27 AM ]