Ed Oliver
Without question, one of the most improved players this season has been defensive tackle Ed Oliver. The Bills agreed to a contract extension with Oliver before the season and it is a move that looks like it is going to end up being a bargain in the near future, if it isn't already.
Oliver has started all 11 games this season and has 40 total tackles (three short of his career-high), 11 tackles for a loss (already a career high), 11 QB hits (three short of his career-high), and six sacks (already a career-high).
Even without DaQuan Jones since Week 5, Oliver has been a force on the interior of the defensive line and making big plays when needed. A great example of this was late against the Philadelphia Eagles when Jalen Hurts tried a QB draw as it looked like the linebackers were dropping back. However, Oliver instead of trying to get into the backfield, hesitated and slid to his right to stop Hurts for a minimal gain.
Ed Oliver has not made a Pro Bowl yet in his career but he has certainly played at that level this year.