Jim Brown-USA TODAY Sports
The Tennessee defense played their worst game of the season against St. Louis in Week 9. This week against the Jaguars, they weren't much better.
Jurrell Casey had a great game, and the defensive line became dominant as the game went on, but outside of that there were a lot of bad plays.
Bernard Pollard had several costly penalties, including one which took the Jaguars 15 yards for a first down.
Jason McCourty had a poor game as well, as many passes were completed to receivers he was covering.
Akeem Ayers and Zach Brown didn't play terribly, but neither of them made the big plays they're both capable of.
This is the second week in a row that the Titans have seen a noticeably below average performance out of what looked like a very good defense in the first half of the season.
I don't know what's caused such a drastic change in the quality of defensive play—it could be a few key injuries, the change in who's calling defensive plays or something else—but whatever it is, the coaches need to take whatever steps they can to address it, as a solid defense is the Titans' bread and butter.