I am an AHJ and I would not fail someone for using the remaining screw for the grounding conductor. I would however fail you if you wrapped it around the screw the wrong way! ( It has happened more times than I can recall.) The wire has to wrap around the screw clockwise so that the wire tightens up. (Righty tighty, lefty loosey) I think that is how it is spelled!? [Linked Image]