The Texans have signed running back Darius Walker to the practice squad after releasing him earlier in the week.  With Chris Brown out for the season and Ahman Green being gimpy right now Walker could join the active roster for the Texans soon.  Walker rushed for 68 yards this preseason on 22 carries (3.1 ypc) and he also caught 2 passes for 13 yards (6.5 avg).  With the way Walker played for the Texans last season I’m a little surprised that no team wanted to sign him.  Walker played in 4 games (2 starts) last season for the Texans and he carried the ball 58 times for 264 yards (4.6 ypc) with 1 TD run.  He also caught 13 passes for 81 yards (6.2 avg) last season for the Texans.  It was a smart move to bring Walker back but it’s risky putting him on the practice squad.