I agree with the Smoltz thing, and I was referring to the roll prior to release. I'm aware this isn't ideal, but I have seen it happen a few times:
This particular example is what I was referring to when I mentioned the hip action. In the case of Wheeler, though, I do agree that it is not detrimental because it assists that "braking" action you spoke of. I do think that up until actual release, the body should continually be moving forward, and the premature roll highlighted above is an example of that not happening.
Maddux rolled a bit after release as well: