Not that it is a fluke, but that the passing game has clearly suffered without AJ. You could have Foster and AJ going off for 100 yards receiving. How many times have the Texans (Since Schaub arrived) passed for under 150 yards with AJ? Once as far as I can tell. They have done it twice this season without AJ.
But a big reason is because the runninggame is so effective. And why narrow down to just the passinggame? If the offense is doing just as good, or even better, then that's all that matters.