'Ryan acknowledged the roster upheaval, but he pointed to the Bills' 2015 draft as a reason to believe the roster will get the necessary infusions it needs to overcome the heavy player losses. Buffalo did not have a first-round pick last year, but still came away with cornerback Ronald Darby, guard John Miller, and running back Karlos Williams, players who stepped right in and made big contributions — Darby and Miller as starters, Williams as a key backup who excelled when he was healthy.'