Two vertebrae in Williams' neck were shaved to help with a nerve issue
Since the close of the 2016 NFL regular season, both the Buffalo Bills and safety Aaron Williams himself have repeated the same message: Williams is fine, he's been cleared to play, and everyone is waiting for the hitting to start to gauge just how ready he is to return to the Bills' starting lineup in the secondary.
There was occasional deviation from that message - Doug Whaley saying that Williams could have played had the Bills made the playoffs, as one example - but by and large, that's what we know.