I believe the reason you haven't seen a lot of interceptions from the secondary is because of two factors:
A small portion of the lack of interceptions is due to the fact that the team has been searching, and has yet to find, a consistent and sustained pass rush. The better the pressure on the quarterback, the more rushed and poor throws you force thus leading to more interceptions.
And secondly, with a relatively new and inexperienced backfield who is learning a new defensive scheme, the secondary hasn't learned each others tendencies and haven't yet gained the confidence you need to start making plays on the ball. Right now the secondary is more focussed on not allowing big plays and who has got their back on each passing play.
Once they fully grasp the defense and have some continuity as a unit and start to rely on instinct, you can almost guarantee you will see more ball hawking from players like Dwight Anderson and Tay Cody.
I really believe the Ticats have some good players in their defensive secondary, they just have to stay healthy, learn to play within the system, and start to make a break on the ball. The interceptions will come ...
Oskee Wee Wee