I wouldn't play Clowney either. He has one game under his belt and not in game shape There was some soreness apparently but not unexpected. Problem is with this offense we're facing it will be tough to limit his snaps so they may not be able to get him off the field if he gets tired or feels something in that knee that bothers him. I doubt Cushing plays either for the same reason.
You've got to be confident you're 100% and the coaches have to have confidence in that too.
The Eagles offense concerns me because it is designed to exploit defensive mistakes pre snap. Something the Texans have done a lot of this season.
It's going to take complete focus on the play in front of them. If a player has other things rattling around in his head like "did I just feel something in my knee?" he won't be able to keep that focus and make the pre snap reads he needs to make.
If the Texans offense can extend some drives by keeping the ball on the ground and keep the Eagles from getting into a groove they might stand a chance. I look for the Eagle to go downfield early and test the secondary. If they can put 10 or 14 up quickly the Texans will have a hard time coming back.
The corners need to jam the Eagles receivers at the line. Also something they aren't real good at. If they play 7 yards off like they usually do Foles is going to light them up.