The Texans brought in Matt Schaub in the off-season and he has played pretty well for them.  Sage Rosenfels has also played well when Schaub has been injured this season.  Schaub has completed 189 of 284 passes (66.5%) for 2,207 yards with 9 TD passes and 9 interceptions (87.3 QB Rating) so far this season.  Although the QB ratings are very close, Schaub is the better athlete and he will likely remain the starter.  Sage Rosenfels has completed 61 of 93 passes (65.6%) so far this season for 729 yards with 7 TD passes and 6 interceptions (87.6 QB Rating) so far this season.