Like Darrin Reaves, this is completely about opportunity. In Winn's defense though, he did actually look much better in his spot duty than Reggie Bush and Joique Bell have, even considering how poor Detroit's rushing attack has consistently been.
Consider that Buffalo is actually a fairly solid defense, that Megatron missed almost the entire game due to his injuries, and that Reggie Bush continues to be ineffective running the ball. All of the lights here are green as well, provided he actually gets an opportunity to get 15 touches in his next squad. Like Reaves, he's low-upside. But unlike Reaves, he showed something during the game. We'll see what Detroit decides to do with him.