Colts defense in the second half was truly the catalyst for them winning their ninth game of the season.
The story of the Colts comeback victory over the Titans, their second comeback win over Tennessee this season, wasn't so much about Andrew Luck, but rather the Colts defense. After coming out and looking quite bad against the Titans on the opening drive, allowing Locker to complete all six of his passes, including an 18-yard TD to tight Jared Cook, the defense started making plays, especially in the second half.
The biggest play of the game came when Cassius Vaughn jumped a route, and Jake Locker threw an awful pick from his own endzone than Vaughn returned for a touchdown. That play, and the extra point that followed, gave Indy their first lead of the game 21-20. The pick was Vaughn's first of the year, and it was a big catalyst for the Colts in the second half.
Davis, who'd been burned a bit in the first half by Kenny Britt, had several big time hits and tackles in the third and fourth quarters, and his coverage was much improved. Darius Butler joined Vaughn in the pick party, cutting in front of receiver Nate Washington and intercepting Locker in the fourth quarter, killing what was developing into a nice Titans drive.
It really cannot be understated just how bad the corners looked in the first half, and then how much better they played in the second. Have they turned a corner? Has the light come on? We shall see.
The other defensive note for this game is how well the Colts contained Chris Johnson. He had 44 yards on 19 carries, no touchdowns. Anytime you can do that to CJ, you have a good chance to win the football game.