The Buffalo Bills didn't have a first round pick in the 2015 NFL draft but they made the most with their first selection at pick 50.
Cornerback Ronald Darby started in 15 games for the Bills this season and looked nothing like a rookie on the field. The cornerback was outstanding in coverage and didn't give up a touchdown until Week 12 against the Kansas City Chiefs. Darby's play on the field didn't go unnoticed at Pro Football Focus. The analytics site gave Darby an 87.1 grade in 2015, the fourth highest grade among all NFL cornerbacks.
Some might prefer Marcus Peters here because he had more positive plays than Darby, including more interceptions and passes defended. Peters led all cornerbacks in positively-graded coverage plays, but Darby wasn’t far behind at sixth-best. However, cornerback is more of a position meant to prevent big plays, as opposed to making big ones. Peters had the second-most negatively-graded plays in coverage, just behind Brandon Browner, while Darby wasn’t even in the top 15.
PFF also added that Darby did not allow any 100-yard games this season. Although Darby is unlikely to win Defensive Rookie of the Year, no defensive rookie finished higher in PFF's rookie of the year voting.