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Every team has a weakness. That's the reality of today's cap-controlled NFL.
So the key is to find a way to mask your biggest flaw. That's where the Lions' defensive line-first philosophy has paid off so well.
Need proof? How about three key plays in the win over the Bears.
How about the 4th-and-1 stop by Rocky McIntosh? The line of scrimmage had already been driven back a full yard by the time running back Michael Bush received the handoff. There's little he can do in that situation.
Or maybe the first time the Lions thwarted the Bears' bid to tie it with a two-point conversion. McCown rolled right and planned on hitting Matt Forte with a quick out. He was covered well by McIntosh, so McCown tried to extend the play.
That doesn't work against Detroit, as the line covered him up for what should have been the game-saving sack. The incidental helmet-to-helmet contact by Willie Young excepted, this was great stuff from the front seven.
Finally, look at the Bears' next two-point conversion attempt. Nick Fairley perfectly executed the one-gap approach where a defensive lineman's objective is to blow through a gap in the line. He timed his rush so well that he was already in the backfield when Forte got the ball, making this an easy play for the big fella.
If you're more of a big-picture person, it's as simple as this: The front seven sets the secondary up for success.
By throttling opposing running games (eighth best), the Lions force offenses into a lot of third-and-long situations. Then, the pass-rushing ability of the linemen gives the quarterback less time to throw routes that require more time, shortening the area the secondary has to cover and creating interception opportunities with forced throws to covered receivers.