Since the Bills won the game, I don't think you can say he "let them down." Perhaps if Walker had struggled with Jackson/Tapp and/or Edwards had gotten hurt, you could make that claim.
And as I said, he didn't come back fat. Possibly winded and that's the "game shape" to which Jauron alluded. I guess we'll find out this weekend.
And while I disagree with the way he handled it, I think he made his point to the Bills. And ultimately nothing bad happened.