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It is a well-known fact that the Texans' defense has been sub par at best.
Perhaps the most glaring deficiency in the Texans' defense was pass coverage. The Texans were constantly being beaten by the long ball. Slant routes, post routes, streaks—they all became four letter words for the Texans.
They were last in the league in pass defense, allowing 4,280 passing yards and 33 passing touchdowns. Defensively, the Texans were the Mr. Hyde to the offenses Dr. Jekyll. They were constantly being beat and, more times than not, it cost them the game.
This year the Texans brought in CB Johnathan Joseph (from CIN) and FS Danieal Manning (from CHI) to help stop the bleeding yards. Additionally, Glover Quin has made a move from CB to SS where, according to Coach Wade Phillips, he can be a Pro Bowl playmaker.
The Texans may need to find a solution for the CB spot opposite of Joseph if Kareem Jackson does not step up. His play last year was atrocious, although he is not solely to blame. He has looked better this season (although it is only the preseason) and has to fight to keep Jason Allen from taking his starting spot on the roster.
If the Texans can bring additional pressure to the quarterback, they may be able to prevent many of the deep passes that hurt them so bad last season. However, even if the passes come, the Texans must have better protection in the backfield and must maintain solid coverage to prevent big gains through the air.