His first game back will naturally gain a lot of attention because of who he is and what he did, if it is against the Texans there will be extra spice because he used to play for them. But his reason for leaving Houston is not (as far as we know) connected in any way with his misdeeds, and his desire to get out was announced before the allegations came to light.
The Texans seemed to be on the up, and much of this was because of the play of its QB. He wanted out when he realised how badly run the club really is, and now we are perhaps the worst team in the league. Most fans agreed with his anger towards the club.
So if the Texans are having an even worse season than predicted, then the presence of the guy who had given them hope could lead to some fans venting their anger at the club instead.