Had Leno been available at the start of free agency, few would have been interested, but circumstances have obviously changed. Tevi's film is not good. He's below average. He's not a starting NFL LT. Over the course of a 17 game season, the difference between Tevi and an average-to-above average starting NFL LT in Leno would be quite noticeable.
Kick the tires, he OBVIOUSLY is HIGHLY intelligent as he went to THE Ohio State University.
IMHO, This defense can be successful with CBs that have some size, an ability to (and enough speed) to break on the ball, and and can tackle.