Ravens figure to attack down field with McNair

The Ravens' trade of Steve McNair benefits Baltimore in multiple ways.

The most obvious benefit is that McNair represents a significant upgrade over Kyle Boller, though surprisingly, McNair's 2005 metrics weren't much better than Boller's. McNair averaged 6.9 yards per catchable attempt last season, while Boller averaged 6.8.

So why were McNair's numbers so low last year?