... particular defense is working, and at their current level of experience.

I believe Howell is 'dialing up' the defense a bit differently,
to leverage the strong points of all 11 defenders on the field
at a time, and cover their weaknesses.

Plus, if they have tall WR's, the addition of Davis and his improved
skill level over last year, changes the mix we throw at them. They
saw Davis at UConn, but they didn't see how he and JJ and RD
play together with the other DB's.