... Jack Harver's "State of the DTs" series, introduced here.]

In the three years since Baltimore drafted Haloti Ngata, several spots on the Ravens' defense have been weakened.

Their secondary has taken the biggest hit. Corners Samari Rolle and Chris McAlister were aces in 2005, the year before Ngata arrived. 

Baltimore signed Rolle in free agency when Tennessee couldn't afford to retain him, and McAlister had just been re-signed to a seven-year, $55 million deal.

The tandem had three All-Pro selections combined, and seemed set to key Baltimore's pass defense going forward.

Rolle s...

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