I'm on the side that they have a right to be confident. They have looked good on both sides of the ball, and Dalton is having a career season. Eifert is finally playing as expected and Green and Sanu are legit.
Still, this is our house and Shady returning tells me the Bills know how serious this game is. For the Bengals, this is an out of division game when they have a huge lead within it. For the Bills it's scratching and clawing to get as many wins as they can to not get left behind.