Arian Foster has been a little off this season, since he's still nursing a hamstring injury. However, if he is healthy, he is a dangerous offensive weapon.
With Andre Johnson out of the lineup, Arian Foster's play will be much more important to the Texans' offense than it used to be. If he can get them consistent yardage, the Texans will be able to put up points.
On the other hand, if the Titans can shut him down, then the Texans will struggle.
So far this season, the Titans' rush defense has been pretty good, only allowing 105 rushing yards per game, and that's against running backs such as Ray Rice, Peyton Hillis and Maurice Jones-Drew.
Arian Foster is in the same elite company as those players, and the Titans were able to stop most of them pretty effectively. If they can do the same against Arian Foster, then the Titans will win the day, which may make them playoff bound.